It is possible to have IK solver without actual bones. There was a relation
created for this case, but it was originating from a wrong operation: it
was possible to run into situation when init is not yet done, but cleanup
is already run.
Fix the relation which ensures the order to go from IK initialization and
not the pose initialization. This should ensure proper cleanup order.
There is a relation from pose initialization to IK initialization so this
change should not cause any missing relations.
This should fix the intermittent failure of blendfile_versioning_1_over_8.
Pull Request: https://projects.blender.org/blender/blender/pulls/128267
437ca00f92