When Villagers get up their bed, they sometimes spawn in walls and disappear [die?]

[mark: i´m playing on Win10, but because it´s on a server, it could be on everyones mobile/tablet...]

Hello,

on my private survival server [hostet by Nitrado] I build a normal villager trading hall. Their beds are surrounded by mainly cobblestone, only one side is open; their stands their work station [picture 2]. Sometimes, when it gets day and the villagers get up, some disappear. Im sure that must be, because they spawn in the walls and not on their bed/workstation (the only places where they could spawn).

I build a second trading hall [picture 1]. Interesting is, that the villagers, who sleep in the bed rightmost, also disappears, when weaking them up or the get up by them selfs.

 

So I think, that the villagers maybe normaly try to get up to the right of their beds, even when there are blocks (so they die).

Or has it another reason?