Skeletal Mesh Editing Tools destroys Metahuman postprocess?

Hi,

Trying to test and use the Skeletal Mesh Editing tools on a metahuman mesh to add some bones.
What i have noticed that if you edit and save the mesh, event without adding anything or changing anything on the mesh. The post process anim blueprint stops working as it should, and it skews the mesh totally deforming it.

Anyone noticed this? Any workarounds?