Beds can be placed inside entities

The bug

Nomally you can’t place blocks inside the player or mobs, however beds can be placed inside an entity. Relates to MCPE-65671, MCPE-112516 and MCPE-39674.

How to reproduce:

1. Look down
2. Place a bed
   Observed Result: The bed was placed and you got pushed away from the bed.
   Expected Result: The bed doesn’t get placed, because you would stand inside the bed.