I was playing UHC with my friend @Jami_D and eventually it started to count down for deathmatch, us two in one team and one other person. When we got teleported, there was nobody else there, just me and my friend. The scoreboard said that on eother team still had one player left, but the tab menu only had me and Jami (I'm not sure if it only shows your team or if the other person wasn't there but the scoreboard hadn't updated). Eventually the border got to us, but we didn't die, it didn't even notify us in the chat that we were outside the border. This meant that we could basically just play survival in UHC mode, so we did for a bit, hah. I've had a glitch where the border doesn't take away your hunger/health in deathmatch before, but not where there seems to be another person but isn't.