> whereas in Civ2 (legit Civ) they just get auto-pushed back to the borders immediatly.

Maybe you're thinking Civ 3? Civ 2 doesn't have borders. If you have units close to other civ's city, they will demand you to withdraw. If you agree, they're teleported to your nearest city.

ah yes you're right! Regardless, i don't think they're mean to get stuck haha. The more offensive element of this issue to me is that the UX gives no feedback, it just doesn't work and gives an audible buzz.