Mob body rotation gets weird when updating Motion NBT

Steps to Reproduce (Mannequin Entity)

1. Place a Command Block: Set it to Repeat and Always Active.

2. Input the Command: Use the following command to target the nearest non-player entity: data merge entity @n[type=!minecraft:player] {Motion:[0.1,-0.3,0], Rotation:[0f,0f]}

3. Summon a Mannequin: Use /summon minecraft:mannequin. Observe that its body and head directions are applied correctly as intended.

4. Summon any other Mob: Summon an entity that has Rotation data (e.g., Villager, Evoker, Vindicator, or Piglin).

5. Observe the Issue: Notice how the mob moves sideways in a very awkward way while its facing direction remains frozen, unlike the Mannequin.

This appears to be the same phenomenon where Motion and Rotation NBTs are handled improperly upon data modification.