I have had this on PS5 as well. Usually this works without any issues and all times has been saved correctly, even after several improvements in same session.
Today this issue happened again. In this case I had to pause my lap, and when I continued driving, improvements where not saved any more. Not sure, if this had anything to do with the issue, but just sharing, if it helps anyone, or with solving this bug.
Same here, but actually affects Multiplayer weekly event Quali as well, the game just does not upload lap times most of the time. Also noticed set rival disappears after one lap. It should not be the case.
