diff --git a/docs/50_Step记录/STEP-043A_40-02C源码审查后最小修正_v1.md b/docs/50_Step记录/STEP-043A_40-02C源码审查后最小修正_v1.md
new file mode 100644
index 000000000..ccabb5fe4
--- /dev/null
+++ b/docs/50_Step记录/STEP-043A_40-02C源码审查后最小修正_v1.md
@@ -0,0 +1,6 @@
+# STEP-043A 40-02C 源码审查后最小修正
+
+- 基线：`5dd4dbf4967c1238e1bde8fb66fe3dbd2c4fe52a`
+- 状态：`IMPLEMENTED / WAITING FOR ANDROID VALIDATION`
+- 修正：GPU texture reuse 保留旧 backing 但消费 wanted snapshot revision；MIX_REJECTED 不再改变 timeMix；增加 Layer/Resource/Field upload/reuse/reset 生命周期日志；所有 Style reload 调用点有具体 reason。
+- 检查：shader generator、Linux Core/source-test object、format、diff check 通过；未运行 Android Gradle、ADB 或设备。
diff --git a/docs/50_Step记录/STEP-043_40-02C_Android双时间片GPU时间插值最终修正_v1.md b/docs/50_Step记录/STEP-043_40-02C_Android双时间片GPU时间插值最终修正_v1.md
index 3baa77a56..8c6f355b4 100644
--- a/docs/50_Step记录/STEP-043_40-02C_Android双时间片GPU时间插值最终修正_v1.md
+++ b/docs/50_Step记录/STEP-043_40-02C_Android双时间片GPU时间插值最终修正_v1.md
@@ -5,3 +5,4 @@
 - 规则：generation 仍是 source revision；GPU reuse 比较 fixtureID、dataVersion、已验证 `fieldSha256` 和 grid compatibility。MIX 未就绪只记录 `MIX_REJECTED`，不 reload style。
 - 检查：shader generator、Linux Core/source test object、format、diff check 通过；未运行 Android Gradle/ADB。
 - Android：T1--T10 仍待用户执行，不能判 PASS。
+- STEP-043A 源码审查发现 reuse revision、MIX reject state、diagnostics 与 Style reason 缺口，均已最小修正；状态不变。
diff --git a/docs/报告/STEP-043A_40-02C源码审查后最小修正_Codex完成报告_v1.md b/docs/报告/STEP-043A_40-02C源码审查后最小修正_Codex完成报告_v1.md
new file mode 100644
index 000000000..48de4aa5c
--- /dev/null
+++ b/docs/报告/STEP-043A_40-02C源码审查后最小修正_Codex完成报告_v1.md
@@ -0,0 +1,18 @@
+# STEP-043A 40-02C 源码审查后最小修正完成报告
+
+开始基线为 `5dd4dbf4967c1238e1bde8fb66fe3dbd2c4fe52a`，状态为 `IMPLEMENTED / WAITING FOR ANDROID VALIDATION`。
+
+- Reuse：旧 T0/T1 texture/image 可复用，但 `resources` snapshot 现在写入 wanted revision，避免下一帧重复 sourceChanged。
+- MIX：guard 完成后才赋值 `timeMix`；拒绝时没有 state/property/style mutation。
+- Diagnostics：新增 renderLayerInstanceId、LAYER_CREATE/DESTROY/CHANGED、FIELD_UPLOAD、FIELD_REUSE、SIMULATION_RESET/resetCount 与 TIME_MIX_UPDATE 关联字段。
+- Style：INITIAL、ENABLE、DISABLE、UNIFORM_EAST、UNIFORM_NORTH、TIME_WINDOW、ADVANCE 等调用点均传明确 reason；MIX 不会触发 Style load。
+- 检查：shader generator、Linux Core/source-test object、clang-format、diff check 通过。未运行 Android Gradle、ADB 或设备验证。
+
+用户手工：
+
+```bash
+cd /mnt/sda1/MapLibreParticleLab/platform/android
+./gradlew :MapLibreAndroidTestApp:assembleOpenglDebug --console=plain
+```
+
+随后以 `adb -s 192.168.1.146` 安装并验证 T1--T10；在用户设备验收前不得判 PASS。
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 473c0b676..2dcb9b2e7 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
@@ -53,7 +53,7 @@ class ParticleCoreLayerValidationActivity : AppCompatActivity() {
                     .zoom(2.0)
                     .build()
             }
-            loadValidationStyle(active = active, enabled = enabled)
+            loadValidationStyle(active = active, enabled = enabled, reason = "INITIAL")
         }
 
         findViewById<Button>(R.id.validationActive).setOnClickListener {
@@ -63,10 +63,10 @@ class ParticleCoreLayerValidationActivity : AppCompatActivity() {
             if (this::maplibreMap.isInitialized) setValidationProperties(active = false, maskMode = maskMode)
         }
         findViewById<Button>(R.id.validationDisable).setOnClickListener {
-            if (this::maplibreMap.isInitialized) loadValidationStyle(active = active, enabled = false)
+            if (this::maplibreMap.isInitialized) loadValidationStyle(active = active, enabled = false, reason = "DISABLE")
         }
         findViewById<Button>(R.id.validationEnable).setOnClickListener {
-            if (this::maplibreMap.isInitialized) loadValidationStyle(active = active, enabled = true)
+            if (this::maplibreMap.isInitialized) loadValidationStyle(active = active, enabled = true, reason = "ENABLE")
         }
         findViewById<Button>(R.id.validationGlobal).setOnClickListener {
             if (this::maplibreMap.isInitialized) setValidationProperties(active = active, maskMode = MASK_GLOBAL)
@@ -80,18 +80,18 @@ class ParticleCoreLayerValidationActivity : AppCompatActivity() {
         findViewById<Button>(R.id.validationUniformEast).setOnClickListener {
             timeWindowMode = false
             fixtureMode = FIXTURE_UNIFORM_EAST
-            if (this::maplibreMap.isInitialized) loadValidationStyle(active, enabled)
+            if (this::maplibreMap.isInitialized) loadValidationStyle(active, enabled, "UNIFORM_EAST")
         }
         findViewById<Button>(R.id.validationUniformNorth).setOnClickListener {
             timeWindowMode = false
             fixtureMode = FIXTURE_UNIFORM_NORTH
-            if (this::maplibreMap.isInitialized) loadValidationStyle(active, enabled)
+            if (this::maplibreMap.isInitialized) loadValidationStyle(active, enabled, "UNIFORM_NORTH")
         }
         findViewById<Button>(R.id.validationTimeWindow).setOnClickListener {
             timeWindowMode = true
             fixtureMode = FIXTURE_UNIFORM_EAST
             timeMix = 0.0f
-            if (this::maplibreMap.isInitialized) loadValidationStyle(active, enabled)
+            if (this::maplibreMap.isInitialized) loadValidationStyle(active, enabled, "TIME_WINDOW")
         }
         findViewById<Button>(R.id.validationMix0).setOnClickListener { setTimeMix(0.0f) }
         findViewById<Button>(R.id.validationMix50).setOnClickListener { setTimeMix(0.5f) }
@@ -100,7 +100,7 @@ class ParticleCoreLayerValidationActivity : AppCompatActivity() {
             timeWindowMode = true
             fixtureMode = FIXTURE_UNIFORM_NORTH
             timeMix = 0.0f
-            if (this::maplibreMap.isInitialized) loadValidationStyle(active, enabled)
+            if (this::maplibreMap.isInitialized) loadValidationStyle(active, enabled, "ADVANCE")
         }
         findViewById<Button>(R.id.validationDateline).setOnClickListener {
             maplibreMap.cameraPosition = CameraPosition.Builder().target(LatLng(0.0, 179.0)).zoom(2.0).build()
@@ -131,7 +131,7 @@ class ParticleCoreLayerValidationActivity : AppCompatActivity() {
         this.fixtureMode = fixtureMode
         val layer = maplibreMap.style?.getLayer(PARTICLE_LAYER_ID)
         if (layer == null || !enabled) {
-            loadValidationStyle(active, enabled)
+            loadValidationStyle(active, enabled, "LAYER_NOT_READY")
             return
         }
         layer.setProperties(
@@ -143,7 +143,7 @@ class ParticleCoreLayerValidationActivity : AppCompatActivity() {
     }
 
     private fun setTimeMix(value: Float) {
-        timeMix = value.coerceIn(0.0f, 1.0f)
+        val requestedTimeMix = value.coerceIn(0.0f, 1.0f)
         val layer = maplibreMap.style?.getLayer(PARTICLE_LAYER_ID)
         val rejectReason = when {
             !styleReady -> "STYLE_LOADING"
@@ -156,6 +156,7 @@ class ParticleCoreLayerValidationActivity : AppCompatActivity() {
             Log.i(TAG, "ParticleGPU: event=MIX_REJECTED reason=$rejectReason styleEpoch=$styleLoadEpoch")
             return
         }
+        timeMix = requestedTimeMix
         layer.setProperties(PaintPropertyValue("raster-particle-time-mix", timeMix))
         status.text = statusText()
         Log.i(TAG, "ParticleGPU: event=MIX_PROPERTY_ONLY value=$timeMix styleEpoch=$styleLoadEpoch")
diff --git a/src/mbgl/renderer/layers/render_particle_validation_layer.cpp b/src/mbgl/renderer/layers/render_particle_validation_layer.cpp
index 90a0aced5..4a260fc91 100644
--- a/src/mbgl/renderer/layers/render_particle_validation_layer.cpp
+++ b/src/mbgl/renderer/layers/render_particle_validation_layer.cpp
@@ -48,6 +48,7 @@ constexpr Size MaskSize{16, 16};
 std::atomic_uint64_t nextGpuGeneration{0};
 std::atomic_uint64_t nextMaskGeneration{0};
 std::atomic_uint64_t nextFieldGeneration{0};
+std::atomic_uint64_t nextRenderLayerInstanceId{0};
 
 struct ParticleSettings {
     bool active;
@@ -144,6 +145,7 @@ void removeTargets(const std::vector<RenderTargetPtr>& targets, UniqueChangeRequ
 
 class ParticleGpuResources {
 public:
+    uint64_t renderLayerInstanceId = 0;
     uint64_t generation = 0;
     uint64_t committedFrame = 0;
     uint8_t stateRead = 0;
@@ -168,6 +170,7 @@ public:
     uint64_t nextFieldGeneration = 0;
     uint64_t gpuNextFieldGeneration = 0;
     uint64_t fieldUploadCount = 0;
+    uint64_t resetCount = 0;
     float timeMix = 0.0f;
     uint8_t fixtureMode = 255;
     uint8_t loggedMaskMode = 255;
@@ -192,7 +195,12 @@ public:
     uint8_t stateWrite() const { return static_cast<uint8_t>(1 - stateRead); }
     uint8_t trailWrite() const { return static_cast<uint8_t>(1 - trailRead); }
 
-    void resetSequence() {
+    void resetSequence(const char* reason) {
+        ++resetCount;
+        Log::Info(Event::Render,
+                  "ParticleGPU: event=SIMULATION_RESET reason=" + std::string(reason) + " renderLayerInstanceId=" +
+                      std::to_string(renderLayerInstanceId) + " resourceGeneration=" + std::to_string(generation) +
+                      " resetCount=" + std::to_string(resetCount));
         committedFrame = 0;
         stateRead = 0;
         trailRead = 0;
@@ -511,22 +519,29 @@ RenderRasterParticleLayer::RenderRasterParticleLayer(Immutable<style::Layer::Imp
           return makeMutable<style::ParticleRenderLayerProperties>(
               std::move(impl_), settings.active, settings.maskMode, settings.fixtureMode, settings.timeMix);
       }()) {
+    renderLayerInstanceId = ++nextRenderLayerInstanceId;
     formalSource = baseImpl->getTypeInfo() == style::RasterParticleLayer::Impl::staticTypeInfo();
     Log::Info(Event::Render,
-              "ParticleRender: RenderLayer create id=" + getID() +
+              "ParticleGPU: event=LAYER_CREATE layerId=" + getID() +
+                  " renderLayerInstanceId=" + std::to_string(renderLayerInstanceId) +
                   " source=" + (formalSource ? baseImpl->source : std::string("validation-only")));
 }
 
 RenderRasterParticleLayer::~RenderRasterParticleLayer() {
     if (gpuResources) {
         Log::Info(Event::Render,
-                  "ParticleValidation30_02: resources destroy generation=" + std::to_string(gpuResources->generation) +
+                  "ParticleGPU: event=LAYER_DESTROY layerId=" + getID() +
+                      " renderLayerInstanceId=" + std::to_string(renderLayerInstanceId) +
+                      " resourceGeneration=" + std::to_string(gpuResources->generation) +
                       " contextDestroyed=" + (gpuResources->contextDestroyed ? "true" : "false"));
     }
     Log::Info(Event::Render, "ParticleValidation: RenderLayer destroy id=" + getID());
 }
 
 void RenderRasterParticleLayer::evaluate(const PropertyEvaluationParameters&) {
+    Log::Info(Event::Render,
+              "ParticleGPU: event=LAYER_CHANGED layerId=" + getID() +
+                  " renderLayerInstanceId=" + std::to_string(renderLayerInstanceId));
     const auto settings = particleSettings(baseImpl);
     auto properties = makeMutable<style::ParticleRenderLayerProperties>(
         baseImpl, settings.active, settings.maskMode, settings.fixtureMode, settings.timeMix);
@@ -612,6 +627,7 @@ void RenderRasterParticleLayer::update(gfx::ShaderRegistry& shaders,
     }
     if (!resources) {
         auto owned = std::make_shared<ParticleGpuResources>();
+        owned->renderLayerInstanceId = renderLayerInstanceId;
         owned->generation = ++nextGpuGeneration;
         owned->formalDisplay = formalSource;
         owned->shader = context.getGenericShader(shaders, ShaderName);
@@ -663,10 +679,22 @@ void RenderRasterParticleLayer::update(gfx::ShaderRegistry& shaders,
                 return;
             }
             owned->fieldTexture->setImage(owned->fieldImage);
+            Log::Info(Event::Render,
+                      "ParticleGPU: event=FIELD_UPLOAD slot=T0 reason=RESOURCE_CREATE fieldUploadCount=1 "
+                      "sourceGeneration=" +
+                          std::to_string(owned->field.generation) +
+                          " renderLayerInstanceId=" + std::to_string(owned->renderLayerInstanceId) +
+                          " resourceGeneration=" + std::to_string(owned->generation));
             owned->fieldTexture->setSamplerConfiguration({.filter = gfx::TextureFilterType::Nearest,
                                                           .wrapU = gfx::TextureWrapType::Repeat,
                                                           .wrapV = gfx::TextureWrapType::Clamp});
             owned->nextFieldTexture->setImage(owned->nextFieldImage);
+            Log::Info(Event::Render,
+                      "ParticleGPU: event=FIELD_UPLOAD slot=T1 reason=RESOURCE_CREATE fieldUploadCount=2 "
+                      "sourceGeneration=" +
+                          std::to_string(owned->nextField.generation) +
+                          " renderLayerInstanceId=" + std::to_string(owned->renderLayerInstanceId) +
+                          " resourceGeneration=" + std::to_string(owned->generation));
             owned->nextFieldTexture->setSamplerConfiguration({.filter = gfx::TextureFilterType::Nearest,
                                                               .wrapU = gfx::TextureWrapType::Repeat,
                                                               .wrapV = gfx::TextureWrapType::Clamp});
@@ -748,22 +776,41 @@ void RenderRasterParticleLayer::update(gfx::ShaderRegistry& shaders,
                                                   .wrapU = gfx::TextureWrapType::Repeat,
                                                   .wrapV = gfx::TextureWrapType::Clamp});
                 ++resources->fieldUploadCount;
+                Log::Info(Event::Render,
+                          "ParticleGPU: event=FIELD_UPLOAD reason=NEW_CONTENT fieldUploadCount=" +
+                              std::to_string(resources->fieldUploadCount) +
+                              " sourceGeneration=" + std::to_string(field.generation) +
+                              " renderLayerInstanceId=" + std::to_string(resources->renderLayerInstanceId) +
+                              " resourceGeneration=" + std::to_string(resources->generation));
                 return true;
             };
             auto takeSlot = [&](const particle::ParticleFieldSnapshot& wanted,
+                                const char* destination,
                                 particle::ParticleFieldSnapshot& assigned,
                                 std::shared_ptr<PremultipliedImage>& image,
                                 gfx::Texture2DPtr& texture) {
                 if (particle::sameFieldGpuContent(oldT0, wanted)) {
-                    assigned = oldT0;
+                    assigned = wanted;
                     image = resources->fieldImage;
                     texture = resources->fieldTexture;
+                    Log::Info(Event::Render,
+                              "ParticleGPU: event=FIELD_REUSE from=OLD_T0 to=" + std::string(destination) +
+                                  " oldGeneration=" + std::to_string(oldT0.generation) +
+                                  " newGeneration=" + std::to_string(wanted.generation) +
+                                  " renderLayerInstanceId=" + std::to_string(resources->renderLayerInstanceId) +
+                                  " resourceGeneration=" + std::to_string(resources->generation));
                     return true;
                 }
                 if (particle::sameFieldGpuContent(oldT1, wanted)) {
-                    assigned = oldT1;
+                    assigned = wanted;
                     image = resources->nextFieldImage;
                     texture = resources->nextFieldTexture;
+                    Log::Info(Event::Render,
+                              "ParticleGPU: event=FIELD_REUSE from=OLD_T1 to=" + std::string(destination) +
+                                  " oldGeneration=" + std::to_string(oldT1.generation) +
+                                  " newGeneration=" + std::to_string(wanted.generation) +
+                                  " renderLayerInstanceId=" + std::to_string(resources->renderLayerInstanceId) +
+                                  " resourceGeneration=" + std::to_string(resources->generation));
                     return true;
                 }
                 assigned = wanted;
@@ -775,8 +822,8 @@ void RenderRasterParticleLayer::update(gfx::ShaderRegistry& shaders,
             std::shared_ptr<PremultipliedImage> imageT1;
             gfx::Texture2DPtr textureT0;
             gfx::Texture2DPtr textureT1;
-            if (!takeSlot(nextT0, assignedT0, imageT0, textureT0) ||
-                !takeSlot(nextT1, assignedT1, imageT1, textureT1)) {
+            if (!takeSlot(nextT0, "NEW_T0", assignedT0, imageT0, textureT0) ||
+                !takeSlot(nextT1, "NEW_T1", assignedT1, imageT1, textureT1)) {
                 Log::Error(Event::Render, "ParticleGPU: field switch resource creation failed");
                 return;
             }
@@ -791,7 +838,7 @@ void RenderRasterParticleLayer::update(gfx::ShaderRegistry& shaders,
             resources->gpuFieldGeneration = resources->fieldGeneration;
             resources->gpuNextFieldGeneration = resources->nextFieldGeneration;
             resources->fixtureMode = fixtureMode;
-            if (!windowOverlap) resources->resetSequence();
+            if (!windowOverlap) resources->resetSequence("FIELD_NO_OVERLAP");
             Log::Info(Event::Render,
                       "ParticleGPU: time window advance T0=" + oldT0.fixtureID + " T1=" + oldT1.fixtureID +
                           " -> T0=" + resources->field.fixtureID + " T1=" + resources->nextField.fixtureID +
@@ -807,9 +854,12 @@ void RenderRasterParticleLayer::update(gfx::ShaderRegistry& shaders,
     if (resources->timeMix != requestedTimeMix) {
         resources->timeMix = requestedTimeMix;
         Log::Info(Event::Render,
-                  "ParticleGPU: timeMix=" + std::to_string(resources->timeMix) + " T0=" + resources->field.fixtureID +
-                      " T1=" + resources->nextField.fixtureID + " uploads=" +
-                      std::to_string(resources->fieldUploadCount) + " simulationRebuild=0 trailRebuild=0");
+                  "ParticleGPU: event=TIME_MIX_UPDATE value=" + std::to_string(resources->timeMix) +
+                      " T0=" + resources->field.fixtureID + " T1=" + resources->nextField.fixtureID +
+                      " renderLayerInstanceId=" + std::to_string(resources->renderLayerInstanceId) +
+                      " resourceGeneration=" + std::to_string(resources->generation) +
+                      " fieldUploadCount=" + std::to_string(resources->fieldUploadCount) +
+                      " resetCount=" + std::to_string(resources->resetCount));
     }
 
     if (!resources->lifecycleModeKnown || resources->lifecycleActive != active) {
diff --git a/src/mbgl/renderer/layers/render_raster_particle_layer.hpp b/src/mbgl/renderer/layers/render_raster_particle_layer.hpp
index bd52cf958..2de5b0887 100644
--- a/src/mbgl/renderer/layers/render_raster_particle_layer.hpp
+++ b/src/mbgl/renderer/layers/render_raster_particle_layer.hpp
@@ -34,6 +34,7 @@ private:
     std::optional<particle::ParticleFieldSnapshot> sourceField;
     std::optional<particle::ParticleFieldSnapshot> sourceNextField;
     bool formalSource = false;
+    uint64_t renderLayerInstanceId = 0;
 };
 
 } // namespace mbgl
diff --git a/test/style/source.test.cpp b/test/style/source.test.cpp
index 5e17888df..373d2fd55 100644
--- a/test/style/source.test.cpp
+++ b/test/style/source.test.cpp
@@ -231,6 +231,16 @@ TEST(Source, RasterArrayGpuContentIdentityExcludesRuntimeGeneration) {
     EXPECT_FALSE(particle::sameFieldGpuContent(east, changed));
 }
 
+TEST(Source, RasterArrayGpuReuseConsumesNewRevision) {
+    const auto oldT1 = particle::OfflineFixtureParticleAdapter::load("uniform-north", 100);
+    auto wantedNewT0 = oldT1;
+    wantedNewT0.generation = 200;
+    const auto assignedAfterReuse = wantedNewT0;
+
+    EXPECT_TRUE(particle::sameFieldGpuContent(oldT1, wantedNewT0));
+    EXPECT_FALSE(particle::fieldIdentityChanged(assignedAfterReuse, wantedNewT0));
+}
+
 TEST(Source, RasterArrayTimeWindowKeepsIndependentCompatibleSnapshots) {
     const auto east = particle::OfflineFixtureParticleAdapter::load("uniform-east", 11);
     const auto north = particle::OfflineFixtureParticleAdapter::load("uniform-north", 12);
diff --git a/粒子开发记录.md b/粒子开发记录.md
index 549871126..3ce80d4b0 100644
--- a/粒子开发记录.md
+++ b/粒子开发记录.md
@@ -244,3 +244,7 @@
 - 修正 north-positive V 到 Mercator Y 的最终 displacement 符号；Field canonical contract 未变。
 - MIX 移除 Style reload fallback，未就绪只拒绝并记录日志；GPU reuse 使用已验证 SHA-256 content identity，revision generation 仍独立保留。
 - 状态：`IMPLEMENTED / WAITING FOR ANDROID VALIDATION`；未运行 Android Gradle/ADB，T1--T10 待用户验收。
+
+## 2026-09-03 — STEP-043A 源码审查后最小修正
+
+- texture reuse 现消费 wanted revision；MIX reject 不再改变 timeMix；补充 lifecycle diagnostics 与 Style reason。状态仍为 `IMPLEMENTED / WAITING FOR ANDROID VALIDATION`。