What I expected to happen was...
When I jumped on a bed with a trapdoor or slab above my head, I would fall down at the same speed as normal.
What actually happened was...
When I jumped on a bed with a trapdoor or slab above my head, I floated temporarily. This doesn't happen when crouching.
Reproduce
1. Place a bed down.
2. Place a trapdoor or slab on the top half of a block, two blocks above the bed.
3. Jump on the bed, and you will temporarily hover.
Linked issues
is duplicated by 5
MC-116029
If you jump on the bed, when the player is above the head of a slab, he will levitate for half a second.
Resolved
MC-152702
when jumping on a bed with a top slab on top of a player. the player float for a falf a second
Resolved
MC-170763
bug with jumping on a bed with a slab above you
Resolved
MC-230701
Jumping on beds with a trapdoor ceiling causes the jump to be longer than usual
Resolved
MC-276019
Bouncing on bed whilst under upper half block (eg. stairs, slab) causes player to be held above the ground for longer than normal.
Resolved
I don't know if this is a bug, but I am unable to change the category of the bug in the editor and I somehow did it just a second ago.