That's not new to .50. It's been around for awhile, but i've never been able to reliabily duplicate it. Re-opening the project seems to "fix" it.. until it happens again.
I have that issue from time to time on older versions, it appears when I do a lot of changes to a view. It seems to fix it if you just close and reopen that view.
I've had it appear as renaming one object and it renames another instead. Or I set a props value and it goes somewhere else, sometimes even on a different object. Since it can affect other objects unexpectedly I immediately just close and reopen the view and then unfortunately check for any inadvertent changes.