Zombie Villagers wont ride in minecarts.

I built a system to convert villagers into zombie villagers, the send them to a different location to be cured, but for some reason zombie villagers will not ride in minecarts, I attempted to put them inside of the minecart for about 20 minutes with no luck. My world in hard difficulty, so 100% conversion rate to zombie villager, but for some reason they refuse to ride in minecarts.