I decided to move our issues from a next-gen project back to our old project because next-gen is missing many features we still need.
I set up all the issue type mappings for the move, but after the bulk move was complete it looks like all of our 1000+ issues did not map correctly and are all of the type "Task".
This is extremely disheartening, and means many hours of work in order to correctly assign epic vs story vs bug types back to all the issues.
Has anyone else had this happen? Is there any chance of restoring what was lost?