The south transition in one of the deep mushroom forest maps (
http://www.underrail.com/wiki/images/a/ad/Dc-fs2.png) doesn't work correctly.
Upon entering it I end up in the same map (as if I didn't even enter it at all) instead of actually transitioning to another one, so it's pretty much impossible to return to the first area where you wake up after inhaling too much spores.
It's nothing game breaking since there is little reason to go back there, but still.