Sleeping Villagers floating away horizontally and then permanently disappearing at Sunrise

Typical iron farm built in sky with villagers above the spawn platform. Bed height is same as clouds (am wondering if that is a cause). Each night, one sleeping villager slides sideways out of its bed horizontally about 10 to 20 blocks. The villager stays sleeping throughout, and the sideways movement is not always smooth. After a couple of seconds, it will just hang there in the sky, sleeping on thin air and over 100 blocks in the sky. Around Sunrise, the villager will just vanish and never return; however, its bed and workstation seem to stay locked to it. It is very strange to see and a new one is 'taken' every night that I don't sleep myself. I have a very fast connection on an Xbox one X, and have never seen anything like this before, so I don't think it is some sort of lag at my end. Please investigate and fix. As you can image, getting villagers up there is not exactly the highlight of playing the game. THANKS