Before sending the villager through, I was able to trade with him and he looked in my direction and consistently followed my position. After sending him through, he no longer moved or was able to trade. Punching the minecart also erased the villager.

[20:54:57] [Server thread/WARN]: Wrong location! (1, 5) should be (18, 61), aaq['Villager'/14458, l='world', x=29.50, y=75.06, z=90.53]
[20:54:57] [Server thread/WARN]: Tried to add entity minecraft:villager but it was marked as removed already