Another bug which relates to villagers (See MCPE-43958). When you break a bed while a villager has "claimed" the bed, the villager will aimlessly wandering around and will not stop. In one of the 1.13 betas, the behavior has changed. They will no longer wander constantly, but they will still do this only for 5 seconds.

To Reproduce
1. Spawn villager
2. Place bed
3. Break bed once the villager particles appeared in the bed and villager.

Obvserved results
Breaking villager-claimed beds will make them wander around constantly and never stops

Expected Results
Villagers shoudn't wander around too much when their beds are destroyed

Note: There was a bug where if you spawn villagers, they'll start wandering unless you put a bed and they will claim the bed (MCPE-43958). They still do that in 1.12 (though it was fixed in beta 1.11.0.10) by breaking their beds.