Placing doors is not prohibited when any entity is in the way, which is inversely to how placing blocks is prohibited when an entity is in the way. Instead, the affected entity is moved to the closest free area.
Steps to reproduce
Spawn a mob
Place a door at their feet
Video Example
Linked issues
is duplicated by 1
relates to 8
MCPE-121277
Cocoa Beans can be placed inside entities
Open
MC-2208
Blocks with special placement can be placed inside player / entity
Resolved
MCPE-39674
You can place shulkers and shulker boxes in the space as a player
Resolved
MCPE-112516
Lily pads can be placed inside entities
Open
MCPE-119082
Heads can be placed inside entities
Reopened
3 more links
Attachments
Comments 2
That's not likely. See the related report MCPE-39674.
Is this a bug? I think that's a feature!