When I played there was a point where a couple humans appeared to be hanging from a sign in a park. I tried to shoot them, but my bullets were blocked by the sign. I wonder if maybe the humans were somehow set to walk through solid objects, since that would explain these incidents.
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If you have to add them in manually, that sounds like something that could happen. It was actually kinda funny seeing the humans on the sign though because it was about two humans high and they were directly on top of each other, so it looked like the top human was hanging from the sign and the bottom one hanging from the first XD