Fix crash when modifying animated model skeleton pose from gameplay code during update event

Source/Engine/Level/Actors/AnimatedModel.cpp

@@ -603,7 +603,13 @@ void AnimatedModel::OnAnimationUpdated_Sync()
     // Update synchronous stuff
     UpdateSockets();
     ApplyRootMotion(GraphInstance.RootMotion);
-    AnimationUpdated();
+    if (!_isDuringUpdateEvent)
+    {
+        // Prevent stack-overflow when gameplay modifies the pose within the event
+        _isDuringUpdateEvent = true;
+        AnimationUpdated();
+        _isDuringUpdateEvent = false;
+    }
 }
 
 void AnimatedModel::OnAnimationUpdated()

Source/Engine/Level/Actors/AnimatedModel.h

@@ -60,6 +60,7 @@ private:
     AnimationUpdateMode _actualMode;
     uint32 _counter;
     Real _lastMinDstSqr;
+    bool _isDuringUpdateEvent = false;
     uint64 _lastUpdateFrame;
     BlendShapesInstance _blendShapes;
     ScriptingObjectReference<AnimatedModel> _masterPose;