diff --git a/docs/50_Step记录/STEP-047_Runtime_Timeline与Playback_v2.md b/docs/50_Step记录/STEP-047_Runtime_Timeline与Playback_v2.md
new file mode 100644
index 000000000..200a0a809
--- /dev/null
+++ b/docs/50_Step记录/STEP-047_Runtime_Timeline与Playback_v2.md
@@ -0,0 +1,24 @@
+# STEP-047 Runtime Timeline 与 Playback（集中修复）
+
+状态：IMPLEMENTED / WAITING FOR ANDROID RE-VALIDATION
+
+## Android Validation Round 1
+
+Round 1 结论：PARTIAL / NEEDS FIX。
+
+已通过：Core Timeline READY、自动 MIX、自动 window advance、`OLD_T1 → NEW_T0` reuse、紧凑控制台、MAP/MORE 基础回归、VIS Core property 调用链。
+
+失败或无法充分验证：Pause/Resume UX、速度可视性、Seek 状态语义、GAP/INVALID/RECOVER 入口、播放中 VIS、COLOR 可达性、Preload/Cache 可观测性。
+
+## 本轮修复
+
+- Validation 逻辑时间窗口从 4 秒扩展到 40 秒，6 snapshot 总时长约 200 秒；Core clock 不使用 Android timer。
+- PLAYING→PAUSED 和 PAUSED→PLAYING 保留 cursor；END 时 PLAY 明确从 start restart；END/WAITING 拒绝日志明确。
+- PLAYING 的非 END seek 保持 PLAYING；PAUSED seek 保持 PAUSED；Seek END 进入 ENDED；日志记录状态、cursor、目标窗口和 mix。
+- TIME 菜单直接提供 NORMAL、GAP、INVALID NEXT、RECOVER NEXT；GAP/INVALID 在边界 fail-closed，recover 恢复此前播放/暂停语义。
+- VIS 把 COLOR 放到第二项；Validation 调节步长扩大，状态行即时显示 W/L/O/T/F/C；状态行同时显示 Timeline state/speed。
+- 预加载仍是 Source 的有界 CPU snapshot cache（容量 8，绝不预上传未来 GPU Field）；READY 输出 TIMELINE_PRELOAD，窗口推进输出 TIMELINE_CACHE_HIT。
+
+## 不变项
+
+自动 MIX、GPU T0/T1 window、`OLD_T1 → NEW_T0` reuse、只上传新 T1、无 Style reload/simulation reset/trail clear 的正常推进路径，及 STEP-046 visual property-only 均未改动。
diff --git a/docs/报告/40-06_Runtime_Timeline与Playback_Codex完成报告_v2.md b/docs/报告/40-06_Runtime_Timeline与Playback_Codex完成报告_v2.md
new file mode 100644
index 000000000..af6edcfb2
--- /dev/null
+++ b/docs/报告/40-06_Runtime_Timeline与Playback_Codex完成报告_v2.md
@@ -0,0 +1,9 @@
+# 40-06 / STEP-047 集中修复完成报告
+
+状态：IMPLEMENTED / WAITING FOR ANDROID RE-VALIDATION
+
+第一轮 Android 验收为 `PARTIAL / NEEDS FIX`，历史结论保留于 STEP-047 v2。此次修复将 Core logical window 拉长至约 200 秒；暂停/恢复、END restart、seek 状态保持、GAP/INVALID/RECOVER 与可见 speed/state 行为均已在 Core/Validation 层修正。
+
+Source 仍是 Timeline 和 CPU preload cache 权威；Renderer 继续只消费当前 T0/T1/mix。CACHE/PRELOAD 日志来自真实 immutable Source entries，而非未来 GPU 上传。自动边界仍走既有 overlap GPU reuse。
+
+未执行 Android Gradle、ADB、Jest 或设备测试；等待一次完整 Android Round 2。
diff --git a/include/mbgl/style/sources/raster_array_source.hpp b/include/mbgl/style/sources/raster_array_source.hpp
index 9a157f320..d9f6c041e 100644
--- a/include/mbgl/style/sources/raster_array_source.hpp
+++ b/include/mbgl/style/sources/raster_array_source.hpp
@@ -77,6 +77,7 @@ private:
     RasterArrayPlaybackState state = RasterArrayPlaybackState::Ready;
     bool gap = false;
     bool invalid = false;
+    RasterArrayPlaybackState stateBeforeWait = RasterArrayPlaybackState::Paused;
     uint64_t windowRevision = 1;
     std::chrono::steady_clock::time_point lastTick{};
     const size_t cacheCapacity_ = 8;
diff --git a/platform/android/MapLibreAndroidTestApp/src/main/java/org/maplibre/android/testapp/activity/particle/ParticleCoreLayerValidationActivity.kt b/platform/android/MapLibreAndroidTestApp/src/main/java/org/maplibre/android/testapp/activity/particle/ParticleCoreLayerValidationActivity.kt
index 5909124e6..d8d66ddcd 100644
--- a/platform/android/MapLibreAndroidTestApp/src/main/java/org/maplibre/android/testapp/activity/particle/ParticleCoreLayerValidationActivity.kt
+++ b/platform/android/MapLibreAndroidTestApp/src/main/java/org/maplibre/android/testapp/activity/particle/ParticleCoreLayerValidationActivity.kt
@@ -34,6 +34,9 @@ class ParticleCoreLayerValidationActivity : AppCompatActivity() {
     private var timeWindowMode = false
     private var styleLoadEpoch = 0L
     private var styleReady = false
+    // Display mirror only; Core remains the playback state authority.
+    private var timelineState = "READY"
+    private var timelineSpeed = "1x"
 
     override fun onCreate(savedInstanceState: Bundle?) {
         active = savedInstanceState?.getBoolean(STATE_ACTIVE, true) ?: true
@@ -111,6 +114,7 @@ class ParticleCoreLayerValidationActivity : AppCompatActivity() {
             timeWindowMode = true
             fixtureMode = FIXTURE_UNIFORM_EAST
             timeMix = 0.0f
+            timelineState = "READY"
             if (this::maplibreMap.isInitialized) loadValidationStyle(active, enabled, "TIME_WINDOW")
         }
         findViewById<Button>(R.id.validationMix0).setOnClickListener { setTimeMix(0.0f) }
@@ -130,16 +134,16 @@ class ParticleCoreLayerValidationActivity : AppCompatActivity() {
             if (this::maplibreMap.isInitialized) duplicateRuntimeFieldWindow()
         }
         findViewById<Button>(R.id.validationVisualDefault).setOnClickListener { resetVisualDefaults() }
-        findViewById<Button>(R.id.validationVisualSizeDown).setOnClickListener { setVisualFloat("raster-particle-line-width", lineWidth - 0.5f) { lineWidth = it.coerceIn(1.0f, 8.0f) } }
-        findViewById<Button>(R.id.validationVisualSizeUp).setOnClickListener { setVisualFloat("raster-particle-line-width", lineWidth + 0.5f) { lineWidth = it.coerceIn(1.0f, 8.0f) } }
-        findViewById<Button>(R.id.validationVisualLengthDown).setOnClickListener { setVisualFloat("raster-particle-particle-length", particleLength - 0.004f) { particleLength = it.coerceIn(0.002f, 0.080f) } }
-        findViewById<Button>(R.id.validationVisualLengthUp).setOnClickListener { setVisualFloat("raster-particle-particle-length", particleLength + 0.004f) { particleLength = it.coerceIn(0.002f, 0.080f) } }
-        findViewById<Button>(R.id.validationVisualOpacityDown).setOnClickListener { setVisualFloat("raster-particle-particle-opacity", particleOpacity - 0.1f) { particleOpacity = it.coerceIn(0.0f, 1.0f) } }
-        findViewById<Button>(R.id.validationVisualOpacityUp).setOnClickListener { setVisualFloat("raster-particle-particle-opacity", particleOpacity + 0.1f) { particleOpacity = it.coerceIn(0.0f, 1.0f) } }
-        findViewById<Button>(R.id.validationVisualTrailDown).setOnClickListener { setVisualFloat("raster-particle-trail-opacity", trailOpacity - 0.1f) { trailOpacity = it.coerceIn(0.0f, 1.0f) } }
-        findViewById<Button>(R.id.validationVisualTrailUp).setOnClickListener { setVisualFloat("raster-particle-trail-opacity", trailOpacity + 0.1f) { trailOpacity = it.coerceIn(0.0f, 1.0f) } }
-        findViewById<Button>(R.id.validationVisualFadeDown).setOnClickListener { setVisualFloat("raster-particle-trail-fade", trailFade - 0.05f) { trailFade = it.coerceIn(0.0f, 0.995f) } }
-        findViewById<Button>(R.id.validationVisualFadeUp).setOnClickListener { setVisualFloat("raster-particle-trail-fade", trailFade + 0.05f) { trailFade = it.coerceIn(0.0f, 0.995f) } }
+        findViewById<Button>(R.id.validationVisualSizeDown).setOnClickListener { setVisualFloat("raster-particle-line-width", lineWidth - 1.0f) { lineWidth = it.coerceIn(1.0f, 8.0f) } }
+        findViewById<Button>(R.id.validationVisualSizeUp).setOnClickListener { setVisualFloat("raster-particle-line-width", lineWidth + 1.0f) { lineWidth = it.coerceIn(1.0f, 8.0f) } }
+        findViewById<Button>(R.id.validationVisualLengthDown).setOnClickListener { setVisualFloat("raster-particle-particle-length", particleLength - 0.012f) { particleLength = it.coerceIn(0.002f, 0.080f) } }
+        findViewById<Button>(R.id.validationVisualLengthUp).setOnClickListener { setVisualFloat("raster-particle-particle-length", particleLength + 0.012f) { particleLength = it.coerceIn(0.002f, 0.080f) } }
+        findViewById<Button>(R.id.validationVisualOpacityDown).setOnClickListener { setVisualFloat("raster-particle-particle-opacity", particleOpacity - 0.25f) { particleOpacity = it.coerceIn(0.0f, 1.0f) } }
+        findViewById<Button>(R.id.validationVisualOpacityUp).setOnClickListener { setVisualFloat("raster-particle-particle-opacity", particleOpacity + 0.25f) { particleOpacity = it.coerceIn(0.0f, 1.0f) } }
+        findViewById<Button>(R.id.validationVisualTrailDown).setOnClickListener { setVisualFloat("raster-particle-trail-opacity", trailOpacity - 0.25f) { trailOpacity = it.coerceIn(0.0f, 1.0f) } }
+        findViewById<Button>(R.id.validationVisualTrailUp).setOnClickListener { setVisualFloat("raster-particle-trail-opacity", trailOpacity + 0.25f) { trailOpacity = it.coerceIn(0.0f, 1.0f) } }
+        findViewById<Button>(R.id.validationVisualFadeDown).setOnClickListener { setVisualFloat("raster-particle-trail-fade", trailFade - 0.12f) { trailFade = it.coerceIn(0.0f, 0.995f) } }
+        findViewById<Button>(R.id.validationVisualFadeUp).setOnClickListener { setVisualFloat("raster-particle-trail-fade", trailFade + 0.12f) { trailFade = it.coerceIn(0.0f, 0.995f) } }
         findViewById<Button>(R.id.validationVisualColor).setOnClickListener { setSpeedColor(!speedColorEnabled) }
         findViewById<Button>(R.id.validationDateline).setOnClickListener {
             maplibreMap.cameraPosition = CameraPosition.Builder().target(LatLng(0.0, 179.0)).zoom(2.0).build()
@@ -150,7 +154,7 @@ class ParticleCoreLayerValidationActivity : AppCompatActivity() {
             Log.i(TAG, "ParticleValidation30_03: WORLD_WRAP preset center=0,0 zoom=0")
         }
         findViewById<Button>(R.id.validationMenuTime).setOnClickListener { showTimeMenu(it) }
-        findViewById<Button>(R.id.validationMenuVisual).setOnClickListener { showMenu(it, "VIS", intArrayOf(R.id.validationVisualDefault, R.id.validationVisualSizeDown, R.id.validationVisualSizeUp, R.id.validationVisualLengthDown, R.id.validationVisualLengthUp, R.id.validationVisualOpacityDown, R.id.validationVisualOpacityUp, R.id.validationVisualTrailDown, R.id.validationVisualTrailUp, R.id.validationVisualFadeDown, R.id.validationVisualFadeUp, R.id.validationVisualColor)) }
+        findViewById<Button>(R.id.validationMenuVisual).setOnClickListener { showMenu(it, "VIS", intArrayOf(R.id.validationVisualDefault, R.id.validationVisualColor, R.id.validationVisualSizeDown, R.id.validationVisualSizeUp, R.id.validationVisualLengthDown, R.id.validationVisualLengthUp, R.id.validationVisualOpacityDown, R.id.validationVisualOpacityUp, R.id.validationVisualTrailDown, R.id.validationVisualTrailUp, R.id.validationVisualFadeDown, R.id.validationVisualFadeUp)) }
         findViewById<Button>(R.id.validationMenuCount).setOnClickListener { showMenu(it, "COUNT", intArrayOf(R.id.validationParticle256, R.id.validationParticle1024, R.id.validationParticle4096, R.id.validationParticle16384, R.id.validationParticle65536, R.id.validationParticle262144, R.id.validationParticle1048576)) }
         findViewById<Button>(R.id.validationMenuMap).setOnClickListener { showMenu(it, "MAP", intArrayOf(R.id.validationGlobal, R.id.validationOceanA, R.id.validationOceanB, R.id.validationDateline, R.id.validationWorldWrap)) }
         findViewById<Button>(R.id.validationMenuMore).setOnClickListener { showMenu(it, "MORE", intArrayOf(R.id.validationActive, R.id.validationStatic, R.id.validationDisable, R.id.validationEnable, R.id.validationUniformEast, R.id.validationUniformNorth, R.id.validationVortex, R.id.validationAdvanceWindow, R.id.validationDuplicateWindow)) }
@@ -166,7 +170,7 @@ class ParticleCoreLayerValidationActivity : AppCompatActivity() {
 
     private fun showTimeMenu(anchor: android.view.View) {
         PopupMenu(this, anchor).apply {
-            val labels = arrayOf("LOAD TIMELINE", "PLAY", "PAUSE", "SPEED 0.5x", "SPEED 1x", "SPEED 2x", "STEP PREV", "STEP NEXT", "SEEK START", "SEEK MID", "SEEK END", "INJECT GAP", "INJECT INVALID", "RECOVER")
+            val labels = arrayOf("SCENARIO NORMAL", "PLAY / RESTART", "PAUSE", "SPEED 0.5x", "SPEED 1x", "SPEED 2x", "STEP PREV", "STEP NEXT", "SEEK START", "SEEK MID", "SEEK END", "SCENARIO GAP", "SCENARIO INVALID NEXT", "RECOVER NEXT")
             labels.forEachIndexed { index, label -> menu.add(0, index, index, label) }
             setOnMenuItemClickListener { item ->
                 when (item.itemId) {
@@ -194,7 +198,12 @@ class ParticleCoreLayerValidationActivity : AppCompatActivity() {
         if (!styleReady || !enabled || !timeWindowMode) { Log.i(TAG, "ParticleTimeline: event=REJECTED reason=STYLE_NOT_READY"); return }
         if (!maplibreMap.controlRasterArraySourceTimeline(PARTICLE_SOURCE_ID, command, value)) {
             Log.i(TAG, "ParticleTimeline: event=REJECTED command=$command")
-        } else Log.i(TAG, "ParticleTimeline: event=COMMAND command=$command value=$value")
+        } else {
+            timelineState = when (command) { 0 -> "PLAYING"; 1 -> "PAUSED"; 6, 7 -> "WAITING"; 8 -> "PAUSED"; else -> timelineState }
+            if (command == 2) timelineSpeed = "${value}x"
+            status.text = statusText()
+            Log.i(TAG, "ParticleTimeline: event=COMMAND command=$command value=$value")
+        }
     }
 
     private fun actionLabel(id: Int): String = when (id) {
@@ -371,7 +380,8 @@ class ParticleCoreLayerValidationActivity : AppCompatActivity() {
         } else {
             "EAST"
         }
-        return "$mask · $runtime · $fields · MIX ${(timeMix * 100).toInt()}% · $particleCount · W ${"%.1f".format(lineWidth)} L ${"%.3f".format(particleLength)} O ${(particleOpacity * 100).toInt()} T ${(trailOpacity * 100).toInt()} F ${(trailFade * 100).toInt()} C ${if (speedColorEnabled) "ON" else "OFF"}"
+        val playback = if (timeWindowMode) " · $timelineState · $timelineSpeed" else ""
+        return "$mask · $runtime · $fields$playback · MIX ${(timeMix * 100).toInt()}% · $particleCount · W ${"%.1f".format(lineWidth)} L ${"%.3f".format(particleLength)} O ${(particleOpacity * 100).toInt()} T ${(trailOpacity * 100).toInt()} F ${(trailFade * 100).toInt()} C ${if (speedColorEnabled) "ON" else "OFF"}"
     }
 
     private fun validationStyle(active: Boolean, enabled: Boolean): String {
diff --git a/src/mbgl/style/sources/raster_array_source.cpp b/src/mbgl/style/sources/raster_array_source.cpp
index 8c26f2f8b..42d915189 100644
--- a/src/mbgl/style/sources/raster_array_source.cpp
+++ b/src/mbgl/style/sources/raster_array_source.cpp
@@ -69,10 +69,11 @@ RasterArrayTimelineFrame RasterArrayTimelineRuntime::tick() {
     while (mix >= 1.0f) {
         if (gap || invalid) {
             mix = 1.0f;
+            stateBeforeWait = state;
             state = RasterArrayPlaybackState::Waiting;
             Log::Warning(Event::Render,
-                         std::string("ParticleTimeline: event=") + (invalid ? "INVALID_WAITING" : "GAP_WAITING") +
-                             " t1=" + entries[t0 + 1].field->fixtureID);
+                         std::string("ParticleTimeline: event=TIMELINE_REJECTED reason=") +
+                             (invalid ? "INVALID_NEXT" : "GAP_HOLD") + " t1=" + entries[t0 + 1].field->fixtureID);
             return frameLocked();
         }
         if (!moveToLocked(t0 + 1)) {
@@ -84,44 +85,70 @@ RasterArrayTimelineFrame RasterArrayTimelineRuntime::tick() {
         Log::Info(Event::Render,
                   "ParticleTimeline: event=WINDOW_BOUNDARY oldT1=" + entries[t0].field->fixtureID +
                       " newT1=" + entries[t0 + 1].field->fixtureID + " result=APPLIED reuse=OLD_T1_TO_NEW_T0");
+        Log::Info(Event::Render,
+                  "ParticleTimeline: event=TIMELINE_CACHE_HIT index=" + std::to_string(t0 + 1) +
+                      " cacheSize=" + std::to_string(entries.size()) + " capacity=" + std::to_string(cacheCapacity_));
     }
     return frameLocked();
 }
 
 bool RasterArrayTimelineRuntime::play() {
     std::lock_guard<std::mutex> lock(mutex);
-    if (state == RasterArrayPlaybackState::Waiting || state == RasterArrayPlaybackState::Ended) return false;
+    if (state == RasterArrayPlaybackState::Waiting) {
+        Log::Warning(Event::Render, "ParticleTimeline: event=PLAYBACK_REJECTED reason=WAITING");
+        return false;
+    }
+    if (state == RasterArrayPlaybackState::Ended) {
+        t0 = 0;
+        mix = 0.0f;
+        ++windowRevision;
+        Log::Info(Event::Render, "ParticleTimeline: event=PLAYBACK_PLAY reason=RESTART_FROM_END");
+    }
     state = RasterArrayPlaybackState::Playing;
     lastTick = std::chrono::steady_clock::now();
-    Log::Info(Event::Render, "ParticleTimeline: event=PLAY speed=" + std::to_string(speed));
+    Log::Info(Event::Render,
+              "ParticleTimeline: event=PLAYBACK_PLAY speed=" + std::to_string(speed) + " cursor=" + std::to_string(t0));
     return true;
 }
 bool RasterArrayTimelineRuntime::pause() {
     std::lock_guard<std::mutex> lock(mutex);
-    if (state == RasterArrayPlaybackState::Waiting || state == RasterArrayPlaybackState::Ended) return false;
+    if (state == RasterArrayPlaybackState::Waiting || state == RasterArrayPlaybackState::Ended) {
+        Log::Warning(Event::Render, "ParticleTimeline: event=PLAYBACK_REJECTED reason=ENDED_OR_WAITING");
+        return false;
+    }
     state = RasterArrayPlaybackState::Paused;
-    Log::Info(Event::Render, "ParticleTimeline: event=PAUSE");
+    Log::Info(Event::Render, "ParticleTimeline: event=PLAYBACK_PAUSE cursor=" + std::to_string(t0));
     return true;
 }
 bool RasterArrayTimelineRuntime::setSpeed(const float value) {
     if (value != 0.5f && value != 1.0f && value != 2.0f) return false;
     std::lock_guard<std::mutex> lock(mutex);
+    const auto oldSpeed = speed;
     speed = value;
-    Log::Info(Event::Render, "ParticleTimeline: event=SPEED value=" + std::to_string(speed));
+    Log::Info(Event::Render,
+              "ParticleTimeline: event=PLAYBACK_SPEED oldSpeed=" + std::to_string(oldSpeed) +
+                  " newSpeed=" + std::to_string(speed) + " cursor=" + std::to_string(t0));
     return true;
 }
 bool RasterArrayTimelineRuntime::seek(const size_t index) {
     std::lock_guard<std::mutex> lock(mutex);
     if (index >= entries.size()) return false;
+    const auto fromState = state;
+    const auto fromCursor = t0;
     if (index + 1 == entries.size()) {
         t0 = index - 1;
         mix = 1.0f;
         state = RasterArrayPlaybackState::Ended;
     } else {
         moveToLocked(index);
-        state = RasterArrayPlaybackState::Paused;
+        state = fromState == RasterArrayPlaybackState::Playing ? RasterArrayPlaybackState::Playing
+                                                               : RasterArrayPlaybackState::Paused;
     }
-    Log::Info(Event::Render, "ParticleTimeline: event=SEEK index=" + std::to_string(index));
+    Log::Info(Event::Render,
+              "ParticleTimeline: event=PLAYBACK_SEEK fromState=" + std::to_string(static_cast<int>(fromState)) +
+                  " toState=" + std::to_string(static_cast<int>(state)) + " fromCursor=" + std::to_string(fromCursor) +
+                  " toCursor=" + std::to_string(t0) + " targetIndex=" + std::to_string(index) + " t0Index=" +
+                  std::to_string(t0) + " t1Index=" + std::to_string(t0 + 1) + " mix=" + std::to_string(mix));
     return true;
 }
 bool RasterArrayTimelineRuntime::step(const int direction) {
@@ -149,8 +176,8 @@ bool RasterArrayTimelineRuntime::injectInvalid() {
 bool RasterArrayTimelineRuntime::recover() {
     std::lock_guard<std::mutex> lock(mutex);
     gap = invalid = false;
-    if (state == RasterArrayPlaybackState::Waiting) state = RasterArrayPlaybackState::Paused;
-    Log::Info(Event::Render, "ParticleTimeline: event=RECOVERED");
+    if (state == RasterArrayPlaybackState::Waiting) state = stateBeforeWait;
+    Log::Info(Event::Render, "ParticleTimeline: event=RECOVERED state=" + std::to_string(static_cast<int>(state)));
     return true;
 }
 
@@ -332,13 +359,13 @@ void RasterArraySource::tryInitializeTimeline() {
     std::vector<RasterArrayTimelineRuntime::Entry> entries;
     entries.reserve(runtimeFields.size() + 2);
     entries.push_back({std::make_shared<particle::ParticleFieldSnapshot>(*impl().field), 0});
-    entries.push_back({std::make_shared<particle::ParticleFieldSnapshot>(*impl().nextField), 4000});
+    entries.push_back({std::make_shared<particle::ParticleFieldSnapshot>(*impl().nextField), 40000});
     for (size_t index = 0; index < runtimeFields.size(); ++index) {
         if (!runtimeFields[index].snapshot) return;
         auto field = *runtimeFields[index].snapshot;
         field.generation = ++nextRasterArrayFieldGeneration;
         entries.push_back({std::make_shared<particle::ParticleFieldSnapshot>(std::move(field)),
-                           8000 + static_cast<uint64_t>(index) * 4000});
+                           80000 + static_cast<uint64_t>(index) * 40000});
     }
     try {
         timeline = std::make_shared<RasterArrayTimelineRuntime>(std::move(entries));
@@ -348,6 +375,12 @@ void RasterArraySource::tryInitializeTimeline() {
         Log::Info(Event::Render,
                   "ParticleTimeline: event=READY snapshots=" + std::to_string(runtimeFields.size() + 2) +
                       " cacheCapacity=" + std::to_string(timeline->cacheCapacity()));
+        for (size_t index = 0; index < runtimeFields.size() + 2; ++index) {
+            Log::Info(Event::Render,
+                      "ParticleTimeline: event=TIMELINE_PRELOAD timelineId=" + getID() +
+                          " index=" + std::to_string(index) + " cacheSize=" + std::to_string(runtimeFields.size() + 2) +
+                          " capacity=" + std::to_string(timeline->cacheCapacity()));
+        }
         observer->onSourceChanged(*this);
     } catch (const std::exception& error) {
         observer->onSourceError(*this, std::make_exception_ptr(std::runtime_error(error.what())));
diff --git a/粒子开发记录.md b/粒子开发记录.md
index 4ffaf5ba9..3888bacb6 100644
--- a/粒子开发记录.md
+++ b/粒子开发记录.md
@@ -331,3 +331,9 @@
 - RenderRasterParticleLayer 只读取 Source Core 给出的当前 T0/T1/mix；窗口 revision 变化继续进入既有 Field identity/GPU reuse 路径，自动边界维持 `OLD_T1 -> NEW_T0` 的重用语义。正常 timeline MIX 不需要 Style reload。
 - Validation UI 收敛为 `TIME | VIS | COUNT | MAP | MORE`；原有动作均由菜单保留，TIME 提供 load/play/pause/speed/step/seek/gap/invalid/recover。
 - 已加 Source timeline 单元覆盖并运行 Linux/OpenGL Core 精确构建；未运行 Android Gradle、ADB、实体机或 Jest。状态仍为 `IMPLEMENTED / WAITING FOR ANDROID VALIDATION`，等待 Android x86_64 逐项验收。
+
+## 2026-09-04 — 40-06 / STEP-047 Android Round 1 集中修复
+
+- Round 1 为 `PARTIAL / NEEDS FIX`：主链、自动 MIX/window reuse 和紧凑 UI 通过，但 timeline 过短、END/seek 语义、异常入口、VIS 可达性与 cache 可观测性不足。
+- Core validation timeline 改为约 200 秒；END PLAY restart、PLAYING/PAUSED seek 状态保持、GAP/INVALID fail-closed 和 RECOVER 保留此前状态。TIME 直接暴露 NORMAL/GAP/INVALID/RECOVER，VIS 将 COLOR 前置并使用明显的 validation 步长。
+- 仍保持 Source 有界 CPU snapshot preload、GPU 仅 T0/T1、相邻窗口 reuse 与 STEP-046 visual property-only。状态为 `IMPLEMENTED / WAITING FOR ANDROID RE-VALIDATION`。