[4.0 beta10] Skeleton2D/Polygon2D moving/rotating issues when polygon is not on default position

[nachomozo]

Godot version

4.0.beta10.official

System information

Pop!_OS 22.04

Issue description

After assigning a bone to a polygon, if the bone is not at the initial position (0,0), a strange behavior occurs when moving or rotating the bones.

The polygon is translated to incorrect positions (it seems to be based on the center of the original texture and not the polygon itself.

Trying the exactly same nodes on v3.5.1 behaves correctly.

There are a similar closed issue for Godot 3:
#48348

Steps to reproduce

1. Add a Polygon2D node to the root
2. Assign a texture to the Polygon2D and edit the polygon UV to cut the desired part
3. Move it to a new position
4. Add a Skeleton2D node to the root
5. Add a Bone2D node to the Skeleton2D
6. Assign the Bone2D to the Polygon2D and proper weight to de polygon UV
7. Rotate or move the Bone2D

Minimal reproduction project

godot4_bones2d_issue.zip

[JeanKouss]

I have the problem.
System information
Windows 10

[clayjohn]

Right now to have rotations work correctly you need to set the polygon's pivot to be the origin (i.e. 0,0). This was not the case in 3.x, but due to how bones work in 4.0, it may be necessary.