Abandon Workshop bug/glitch: you fall through floor an become stuck in the room an it saves while your in there so you become trapped and there’s no way to get out or advance the game any further. The only option is to restart the game and see if you can try to avoid it the next time. Other details given by other players who experienced the same issue is that it happens 100% of the time. This bug/glitch has been reported several times hopefully a patch fix will be implemented. I’ve experienced this on my ps4 not sure if the pc or other versions have the same issue.
