villagers not work y= 100+

i like to use creative to make  tree houses and we desided we make a village in a treehouse but the villagers acted weird. they got over it, but they were

• sleeping without beds  
• inactive even when hurt
• not using job site blocks
• despawning randomly

i do not know for sure what happened, and it may be because my village had no gathering point. can you look into that? thank you for your time!