Question After SkinnedMesh Component's sharedmesh, animator can't find bones at once. i also assign new bones

1. SkinnedMeshRenderer skinnedMesh;
2. Animator animator;
3. SkinnedMeshRenderer protoTypeSkinnedMesh;
4. Animator protoTypeAnimator;
5. Transform[] bones;
6. GameObject bonesObject;
7. Transform rootBone;
8. animator = obj.GetComponent<Animator>();
9. skinnedMesh = obj.GetComponent<SkinnedMeshRenderer>();
11. protoTypeSkinnedMesh = skinMeshList[id];
13. skinnedMesh.sharedMesh = protoTypeSkinnedMesh.sharedMesh;
14. skinnedMesh.sharedMaterial = protoTypeSkinnedMesh.sharedMaterial;
15. protoTypeAnimator = animators[id];
16. animator.runtimeAnimatorController = protoTypeAnimator.runtimeAnimatorController;
17. animator.avatar = protoTypeAnimator.avatar;
18. Destroy(obj.transform.GetChild(0).gameObject); //hips, for bones
19. bonesObject = Instantiate(bonesObjs[id]);
20. bones = bonesObject.transform.GetComponentsInChildren<Transform>();
22. bonesObject.transform.SetParent(obj.transform);
23. rootBone = bonesObject.GetComponent<Transform>();
24. skinnedMesh.bones = bones;
25. skinnedMesh.rootBone = rootBone;

after run this code, the object's Animator Component show warnings Transform 'Head' has been deleted Transform 'Hand_L' has been deleted Transform 'Head_R' has been deleted .......

but these are the bones before they change. i do 'skinnedMesh.bones = bones;' And during runtime, if I change something in the Animator component in the inspector window, warning goes away and it works as I intended.

i was try animator.Rebind() but it is still..

unity version is 2020.3.38f1