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I think it is a bug, because it takes a while before someone escapes
This is a pretty complicated issue, but we will have a look at the physics and see if there is a corner case we are missing
Is it such a difficult problem that you decided not to correct it?
Ah sorry, I originally posted a message that explained why but it seems to be missing.
We cannot fix it as this scenario is counter to how units expect to behave and can only really be achieved with God Mode. The system that prevents units walking through each other is not built to cope with this "trap" and there is no easy way to make it work. I hope this doesn't cause too many issues for you, sorry.