I've encountered an issue where Villagers on my map do not move for themselves.

This happens for all villagers on the server in different chunks, but not for any other mobs that I can come across.

I have tried to fix this by nearly tripling the gamerule for maxEntityCramming from 24 to 150 but this had no result on the movement for villagers.
The entities can still be pushed just fine.

I have tested this and recreated the issue on multiple servers running the same Spigot build.
Issue does not occur in vanilla server jar.