Regarding Unexpected Behavior with LayeredBlendPerBone Node

Title:
Regarding Unexpected Behavior with LayeredBlendPerBone Node

Content:
I used the ​LayeredBlendPerBone​ node with two blend poses:

  • Blend Pose 0: Blending on the ​Spine_01​ bone.
  • Blend Pose 1: Blending on the ​head​ bone.
  • with ​MeshSpaceRotationBlend​ enabled.

However, the blending result does not match my expectations:
The ​head​ bone’s mesh-space rotation is being affected by Blend Pose 0 (Spine_01 blending). Based on my understanding, if Blend Pose 1 has ​100% weight, the head bone should fully match the input from Blend Pose 1 (otherwise, what is the purpose of MeshSpaceRotationBlend?).

While I know I could use multiple ​LayeredBlendPerBone​ nodes to achieve the desired result, I believe a single node with multiple blend poses should suffice. This makes me question whether I have misunderstood how this node operates.

Any insights would be greatly appreciated!