Act 2 bug with multiplayer?

So my wife and I play, separate PS5 systems. It doesn't happen 100% of the time, but around 50%. We play characters to about level 80 or 90 and immediately change to something new. However, many times while in group, when we return the relics in the Valley of the Titans, one of us, and it happens at random who, cannot receive the quest reward. We have tried leaving party, restarting, blah blah, everything we can think of. We have even turned them in separately, and for whatever reason, it still happens. Has anyone else experienced this? Is there a way to fix or avoid this?