It’s probably one of the few things that make more sense for it to show you what difficulties have been completed on a character due to the lack of informative tracking on the class mission completion penances.
Actually, fixing the penances (both class and overall ones) to tell you what has been completed would have been a better overall solution.
Yeah this is completely stupid, there’s so much in the game that should be account wide and is character-restricted, but the one thing that you actually need to see individual character progress?
Nah, that’s shared.
It’s like the game is actively trying to stop you from understanding and enjoying it sometimes, such a shame…