Revert "Fix the symbol blink issue by only placing the symbol in current level (#3534)" (#3610)

src/mbgl/text/placement.cpp

@@ -276,12 +276,6 @@ JointPlacement Placement::placeSymbol(const SymbolInstance& symbolInstance, cons
         // a parent tile that _should_ be placed.
         return kUnplaced;
     }
-
-    // Place the symbol only at the current level to prevent it from blinking during the transition.
-    if (ctx.getOverscaledID().overscaledZ != int(placementZoom)) {
-        return kUnplaced;
-    }
-
     const SymbolBucket& bucket = ctx.getBucket();
     const mat4& posMatrix = ctx.getRenderTile().matrix;
     const auto& collisionGroup = ctx.collisionGroup;