I started as [3], observer, was possessed by [11], possessor. The ending credits suggested that I started as [11], observer, and that [11] started as [3], possessor. Take a look at the screenshot I posted on the reddit link.
The ending credits should clarify that I started as [3], observer, and should say that 3 ended the game as [3] possessed. It should keep my username next to [3]. It should clarify that [11] started out as possessor, and ended the game as something like “Possessed [3]”. I’m sure there’s a better way to put it though. The possessor’s username should stay behind [11].
To reproduce the bug, have your playey’s body taken over by possessor or take over another players body as possessor. Look at the game-end chart.