The HISM will have double drawcalls when player opens r.Mobile.AllowDitheredLODTransition

Please check the Function GetDynamicMeshElements in HierarchicalInstancedStaticMesh.cpp.

The  Function Traverse in GetDynamicMeshElements will always return two Lod levels, even the transition is finished.

1. Set r.Mobile.AllowDitheredLODTransition=True in DefaultEngine.ini

       2. Set foliage.DitheredLOD=True

       3. Create a HISM actor in level 

       4. Move camera and makes HISM actor stride two Lod's level.

       5. After the dithered LOD transition finished, the drawcalls for HISM is still double. ( two LODs make two drawcalls)

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