Was a new 20v1 mode added?

Lazerboy88

Okay so was playing a normal game of Dbd and once around the game was ending i noticed that more survivors where being added to my game!?! ######### and while it said all these survivors joined I only found one dwight who just seemed afk, and every few seconds a new survivor joined 0.o

Edit platform was Xbox, nothing about the game was unusual before the players started showing up