I’m at a loss. I tried migrating folder by folder from the External Actors folder tree out of the corrupted level. Isolated 3 folders that crashed the level immediately, the rest I was able to migrate individually without crash. However there seemed to be a critical mass of the other folders that i could migrate over before crashing the new level.
all resulting in that same error message.
Maybe some connecting root problem that several actors are referenced to that compounds until it breaks. odd behavior though.