Clear only owners that are no longer in the same tree #56519
Merged
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The changes in #55512 were too eager to reset owners to null. This PR restores the part of the removed logic that will reset owners unless they are still reachable in the pruned branch.
As a result, by the tree exited signals some nodes still keep a reference to their owners (similarly to what happened before #55512):
Fixes #56515.