*Note: this issue is possibly a major cause of (MCPE-191623)
Steps to reproduce
Load [mediaInline] .
Wake up the villager to the right of waldo, then wait for it to sleep again.
Go in the nether portal with the smooth stone blocks above it.
Once in the nether, go back into the portal you came out of.
If waldo is in his bed, repeat steps (2) - (4).
Expected result
The villagers all stay in bed.
Observed result
waldo has been launched 50+ blocks away.
Additional info:
Re: step (2): This issue occurs only if a villager enters a bed next to other villagers some time after the other villagers entered their beds. It does not usually occur when several villagers get in bed next to each other at nearly the same time.
Re: step (3): This issue occurs only if the villagers are fully unloaded by all players leaving the dimension the villagers are in.
Re: step (4): The time of day when reloading the villagers does not matter. The launching happens as soon as the villagers are loaded after being unloaded while in bed.
Additional videos showing that the villagers are launched: