Stunner - non empty sub-process lose it's content after morph

If you have sub-process with content (for an instance Embedded) and try to morph it to another sub-process type (for an instance Event) all content will be lost and sequence flows will be dislocated and it is not possible to Undo this action. See pictures:

P.S. I found a possibility to undo, you can remove sub-process and Undo it, everything looks fine after that.

P.P.S If you try to Undo once before removing sub-process -> sub-process type will be restored, but nodes not, if you remove sub-process now and Undo -> initial sub-process will be restored with all nodes.