Mannequins who have their pose set to "swimming" or "fall_flying" don't tilt when outside water

The mannequins don’t tilt up and down when their pose is set to swimming or fall_flying when out of water. They tilt just fine when in water.

How to reproduce:

1. Execute the following command:

   /summon minecraft:mannequin ~ ~ ~ {pose:"fall_flying",immovable:1b}

2. Execute the following command:

   /rotate @n[type=minecraft:mannequin] 0 -90

   → ❌ The mannequin does not tilt upward.

3. Place water at the mannequin’s position.
   -> ✔ The mannequin tilts upward.