[Tree] Fix TreeObjectHydrator, when $parent field is defined before $children field #2866
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I followed the documentation https://github.com/doctrine-extensions/DoctrineExtensions/blob/main/doc/tree.md#building-trees-from-your-entities
And I'm encountering this error:
The error occurs when the $parent field is defined before $children in a Tree entity. I forked the repository and ran the tests, reversing the order of the fields in tests/Gedmo/Tree/Fixture/RootCategory.php, and I managed to reproduce the same error.