Why does the Behaviour tree always defaults to SelfActor even when saved

Is anyone else having this issue? This is actually debilitating to deal with as nothing is saving even after setting, I have reinstalled the Engine, updated the Engine, restarted my computer, reverted to previous commits (loosing days of work). I have submitted a bug report about this. Besides restarting my entire project, what are some alternatives that I can do.

Also stucking with this problem and search for the answer. My problem is, some Task node’s key selector property was always set back to “Selfactor”, I modify the key, save, run, everything was ok, but next time I restart the engine editor, it was set back to selfactor. I’m using ue version 5.03, what’s your version?