Trying to sleep in a bed on top of trapdoors will say: bed obstructed.

When trying to sleep in a bed on top of trapdoors, a message in chat says: 'bed obstructed' a bit like the obstruction of a bed on scaffolding.

Expected Result:

Sleeping in a bed on trapdoors would be ok to do and no message would come up.

Actual Result:

A message comes up in chat when trying to sleep in a bed on trapdoors.

How to reproduce:

1. Set the time to night and try sleeping in a bed.
2. Place trapdoors (on the upper of a block), place a bed down on them, set the time to night and try to sleep on them.

While a small bug, this does have an effect a hammock tutorial I saw on YouTube (From Java Edition).