Undo in Skeletal Mesh Editor causes model to disappear

I can across this issue when I was Ad Hocing and wanted to pose a skeletal mesh in a certain way. I imported one into my project and moved a bone, then undo and it was gone. I wanted to check if it was the import that was the issue so I went into QA Game to get another Skeletal Mesh.

Note SK_Mannequin does NOT have this issue.

This is a Regression from 4.13.2

1. Open QA Game
2. Open Skeletal Mesh SK_Mannequin_Mobile
3. Select a bone and rotate it
4. Ctrl Z that action

Result: The model disappears from the skeletal mesh editor

Expected: The model reverts to its previous position

Note A workaround would be to close and reopen the Skeletal Mesh Editor