Villagers disappear after a raid and after every new BETA.

Villagers disappear after a raid. My village is totally deserted again. I lost my mending villager whom after a lot of hard work had found him.

In Beta 1.11.0.7 I lost my Stone Mason and in  beta 1.11.0.8 I lost my cartographer and in 1.11.0.9 I lost my farmer

I had a lots of farmer in my village which have disappeared after every Beta.