After finishing a match, and seeing the stats screen, when returning to lobby I was told (and it seems like others were as well) that the match was not over, and the only option was to rejoin the match. Upon doing so, we see the match in the same state it was upon leaving (except our characters had moved around, most likely from being moved back towards base), and we still had access to chat with each other. The UI was in the "dead" state, while we were fully able to play our characters and use their abilities. The Match ID is 38996218.