Joining a friend’s co-op session. After the host fast travels to a location, their gamertag icon that is usually above their head is stuck in the top left corner of the screen, almost off screen. Changing the screen boundaries does not fix it. If the guest (not host player) quits and then rejoins the session, the issue is fixed but returns after fast traveling. The guest’s player icon is unaffected (according to host). Thank you!
Edit: also happens when play solo, hiring an NPC character and then fast traveling. The NPC’s player name icon is as described above.