TYPO3 Core

The changelog entry https://docs.typo3.org/c/typo3/cms-core/main/en-us/Changelog/11.0/Breaking-79565-RemovedUsergroup_cached_listDatabaseField.html only mentions the impact to query the database field.

The field was also populated to the backend user array \TYPO3\CMS\Core\Authentication\BackendUserAuthentication->user['usergroup_cached_list']. Accessing that array entry will result in a warning in more recent PHP versions as it no longer exists.

I'd suggest mentioning this impact as well. That way people reading the changelog might not only search queries but also array access in their code and adapt accordingly.