Taxonomy vocabularies and PHP 8.2 - needs direction / decision.
Core support for PHP 8.2 is on its way. In a previous pull request, we decided to check for property existence in function taxonomy_form_vocabulary_submit() to prevent arbitrary form item values to bloat the object, but it turns out, that's not sufficient and possibly not even appropriate.
Looking at official documentation, it seems like class TaxonomyVocabulary is actually supposed to allow dynamic properties. We just didn't realize, as hook_taxonomy_vocabulary_load() isn't used anywhere in core. And there's no functional test for that hook, either.
Issue #6197 provides more info.
The decision has notable impact on contrib modules.