Y-coordinate problem with mannequins, gravity, and scale

Expected behavior

Hello, I'm having trouble disabling gravity on mannequins and scaling them.

If I set a mannequin to scale 1 (default) with Y coordinates of 81, everything works perfectly (the mannequin on the left in the photo).

However, if I change the scale to 1.5, with the same parameters and Y coordinates of 81, the mannequin doesn't maintain the set Y coordinate (it drops by -0.5) (the mannequin on the right).

(photo to illustrate the difference):

version paper:

my setup for the mannequins:
'test1':
location:
world: world
x: -32.5
y: 81.0
z: -33.5
yaw: 0.0
pitch: 0.0
profile:
texture: "player:Shiino__"
model: WIDE
pose: STANDING
main_hand: RIGHT
immovable: true
invulnerable: true
gravity: false
glowing: true
glow_color: WHITE
hidden_layers: []
scale: 1
'test2':
location:
world: world
x: -28.5
y: 81.0
z: -33.5
yaw: 0.0
pitch: 0.0
profile:
texture: "player:Shiino__"
model: WIDE
pose: STANDING
main_hand: RIGHT
immovable: true
invulnerable: true
gravity: false
glowing: true
glow_color: WHITE
hidden_layers: []
scale: 1.5

Observed/Actual behavior

The Y coordinates are not respected when the scale is changed.

Steps/models to reproduce

Spawn two mannequins with gravity disabled, leave one with a scale of 1 (to check), and another with a scale of 1.5.

Plugin and Datapack List

private plugins

Paper version

1.21.11-117

Other

No response

Start by reproducing the two mannequin configurations from the issue on Paper 1.21.11-117, comparing scale 1 and 1.5 with gravity disabled at Y=81. Trace the mannequin spawning and scaling entry points, then verify that a scaled mannequin remains at the configured Y coordinate.