Test Site Zombies?

[꧁༒African Space Jesus༒꧂]

Me and my friend had just finished a mission in the tier 2 zone when all of a sudden the game went to black screen and loaded both of us into something called test site zombies?
i cannot find anything about this but it was a long mission with multiple steps and we died unfortunately without finishing but idk how we triggered it.
Any Ideas?

[chickenman]

same thing happened to me, its the act II final mission so it must be a bug that it just randomly put us into it. It probably doesn't even give us the progress so we will have to complete it again when we get up to it