Started with update 1.20.40. Villagers randomly lose their connection to beds and work stations. When this happens they will not reconnect. Moving the bed or the workstation will sometimes allow the villager to connect again however if you remove the bed or workstation and place it in the same block as it was previous then the villager will still not connect to it. Effectively this permanently makes the original location of the bed or workstation broken, and the bed or workstation can never be in this location again. Makes player made villages very problematic. 

I added a picture of the city to show the size of it. It had about 40 ish villagers in it. Not sure if the size and number of villagers has any bearing on this problem. However previous to update x.40 there was no problems with it. 

another update. The size of the village seems to not have any impact. This also affects iron farms. Had to break all the beds to remove the village for the farm and then place them again to effectively create a new village to get the farm working again.