Hello,
We’re not aware of any issues with this currently but it seems like this could be related to the GPUScene if it’s fixed with FGlobalComponentRecreateRenderStateContext. If PGO is messing up the bounds or Max WPO displacement that could effect culling and cause what you are seeing. Can you compare your GPUScene primitive and instance data between the two in Pix or Renderdoc to narrow down which calculation is getting messed up?