When editing a movie:
I make a change to the rating
Lock it
Go to posters and select a different poster
Save changes
When I go back to the edit dialog, the rating lock is no longer applied. If I do a save after the rating lock but before the poster change, all is good. If I do the poster change first and then the rating lock, that also works. Not a big deal, but I presume that’s not intended behavior.
Edited to add that the browser is Microsoft Edge.