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everyone. I have a question about Rigify, sorry for terrible English. The question is about bones in "Special" bone group, they have yellow wireframe.

For example, Rigify human rig has "chest" bone. When I rotate this bone, "spine_fk.002" bone is rotated. No problem, I know why it is. enter image description here

When I rotate "spine_fk.002" bone, "chest" bone is rotated. However, I can't find "chest" bone's dependency on "spine_fk.002". I think it has no constraint and is located at higher in hierarchy than "spine_fk.002" bone. Do anyone know why "chest" is rotated like this? enter image description here I want to know it and make this from scratch. Thank you!

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Chest bone itself doesn't move.

You can see that if you remove custom shape:

enter image description here

But what really changes is the bone shape. Override transform is used to display bone in different place, while in reality it not depends on spine_fk.002 to avoid loop in parents errors:

enter image description here

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