Occasionally, the head of a bed in a v2 village will spontaneously disappear leaving an invisible bed foot block behind. The bed is not dropped as an item. The foot block has a hit box and can be broken, after which you can place another bed in the same position.

This happened once as I was watching it. On other occasions it has happened both during the day and at night when the villager was sleeping in the bed; the villager in that case was popped to its feet, and from then on acted as if it could not find a bed until I placed a new bed in the same place which it found immediately, based on it emitting green particles.

I originally discovered this about 2 hours ago when the game crashed while I was AFK. When I reloaded the world, the head of the bed was gone and the foot was invisible but had a hit box.

I am attaching a test world.

Steps to reproduce:

1. In a test world, place a bed so that it crosses a chunk boundary. It doesn't matter what orientation it is.
2. Use a /setblock command to replace the block under the head of the bed.

Actual results:
The bed block above the replaced block breaks, leaving an unbroken and invisible bed block in the other chunk.

Expected results:
The bed is unaffected, as when the bed doesn't cross a chunk boundary. (You can also manually break and replace blocks below a bed without the bed breaking spontaneously.)