"Previous Game" option in Social is inconsistent

Mostly creating this thread on the possibility it’s a bug, and to see if anyone else has had the same experience or could explain what might have happened.

A few days ago I was doing a Heresy run with a friend and two randos and we were doing well together, so agreed to all add each other after the game. Unfortunately after the game the “previous game” option in the Social menu did not show them. Nor were they in the Morningstar tab. Furthermore they didn’t appear in the Steam previous games list.

Very frustrating when trying to find people for higher difficulty content. Any ideas why this would have happened? We finished the match fine with no disconnects/crashes.