When playing in the archive game modes, there isn’t a POTG so no highlights can be saved. The “request highlight” button works, but doesn’t typically save the highlight when the round is finished.
I’ve noticed that Uprising still saves highlights (at least on console) but the other two don’t for some reason. I guess they are connected in some way though.
Uprising still saves highlights on pc as well. I made a post about this yesterday. Hoping the bug will be fixed soon.