When a villager is near a chair or seat, they will automatically sit and never leave the seat again.
this causes problems when you are trying to decorate a village and all villagers cant leave their houses because they got stuck on the chairs.
another issue is that when a villager gives birth, the child spawns inside the chair, causing it to clip through the floor and getting suffocated to death
basically if you fill your village with chairs, the graveyard will fill in no time with death babies. happend three times in my world before i stopped playing to report the issue

Steps to reproduce the behavior:

1. Spawn some villagers
2. place some chairs from the mod Another Furniture by Starfish Studios (didnt check if other mods do the same)
3. get the villager to sit on the chair and then wait for them to give birth or use a spawn egg

MCA version 7.5.17+1.19.2 forge, Another Furniture 1.19.2-2.1.4

a suggestion to resolve the issue may be to make villagers be able to unmount the chair after a certain amount of time, although this may cause problems when transporting villagers over long distances with minecarts or boats. and also change the way the babies spawn, making the baby spawn outside the hitbox of the parent and cheking for it to have a solid block underneat it and not being inside a wall or the floor

I have the same issue with the Create mod seats.

Ive seen this too. I THINK if you try to sit in the chair as well, they leave the chair, but that might just be create chairs