2D bones automatically rotate when “Solve from Default Pose" is unchecked in the LimbSolver2D Component

How to reproduce:
1. Open the user attached project “IK_Bug_Example.zip“
2. Open Scene “SampleScene“ (Assets/Scenes)
3. Enter Play Mode

Expected result: The "Bone_Thigh" GameObject doesn’t rotate
Actual result: The "Bone_Thigh" GameObject rotates

Reproducible with: 7.0.8 (2021.3.14f1), 7.0.9 (2021.3.20f1), 9.0.0 (2022.2.0b14), 9.0.1 (2022.2.9f1), 10.0.0-pre.1 (2023.1.0a24), 10.0.0-pre.2 (2023.1.0b6, 2023.2.0a5)
Can’t test with: 2020.3.45f1 (Error importing prefab)

Reproduced on: macOS 13.0.1 (Intel)

Note:

• The "Bone_Thigh" GameObject can also rotate when selecting it in Edit Mode and moving the mouse pointer between different Unity Engine windows
• The "Bone_Thigh" GameObject can also by just selecting it in the Hierarchy