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I noticed something like that recently, now I've found something similar again: I can't place a wall next to a cliff, but I can walk through at exactly the same place. Also, this particular spot is surrounded completely by cliffs. Yet I can just pass through the "borders", onto the cliff and off again:
Now I wonder if biters can do that too! Perhaps cliffs aren't a reliable part of the defences, after all?

Hello, do you use any mods?

posila wrote: Sun Mar 10, 2019 9:43 am Hello, do you use any mods?

Sorry, that was stupid! I usually know how to report bugs, guess I was up too late last night and had not enough coffee this morning. After turning off all mods, it worked as expected. The culprit seems to be this mod, and if I had looked carefully before, I would have seen this thread in the mod's discussion forum and not posted here.