[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.

Type: Bug
Resolution: Duplicate
Fix Version/s: None
Affects Version/s: 1.21.1
Labels:
None
Environment:

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OS-Windows 10 (latest release)
PC-Intel 12600kf w/ RX6600 and 16gb DDR4 RAM
Allocated RAM-Doesn't matter
Java Version-Default (I have used Java 22 for my test)
Mods-None
In Game Settings-Default (Again doesn't matter to my knowledge)
Game mode-Doesn't matter (to my knowledge)

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OS-Windows 10 (latest release) PC-Intel 12600kf w/ RX6600 and 16gb DDR4 RAM Allocated RAM-Doesn't matter Java Version-Default (I have used Java 22 for my test) Mods-None In Game Settings-Default (Again doesn't matter to my knowledge) Game mode-Doesn't matter (to my knowledge)

Confirmation Status:
Unconfirmed
Category:

(Unassigned)

By placing your character underneath a upper half block such as a slab or stair whilst under a bed and jumping, the player remains in the air for the amount of time as if there is no barrier preventing a jump into the air. However, the player should return to the ground at the same pace as if one was to jump in a two high space. This behavior does not occur on slime blocks. Bug started at version 1.12.

To recreate:

Open a world
Place down bed
Create a 3 block pillar behind bed
Place a upper half block (stair or slab) on top of the bed, on the third block of the pillar.
Jump on bed whilst underneath the half block.

(Sorry for the recording notification in the video, I just started using their software)