Coal Tower: survivors jump on trackchains to not get picked up
Yesterday it happened twice in a match that survivors jumped from the second floor of the main building onto the trackchain below. Luckily I was able to hit them anyway, but then they stayed there so I couldn't pick them up, which was kinda annoying. If I remember right, once it wasn't possible to jump there so I assume it is a bug.
As you can see, no "pick up" prompt.