TYPO3 Core

Debugging shows that it tries to handle the l10n_parent for sys_file_references.

Workaround:

Create TCA override sitesetup/Configuration/TCA/Overrides/sys_file_reference.php with

<?php

$GLOBALS['TCA']['sys_file_reference']['columns']['l10n_parent']['config'] = [
    'type' => 'group',
    'internal_type' => 'db',
    'allowed' => 'sys_file_reference',
    'size' => '1',
    'maxitems' => '1',
    'minitems' => '0',
];

Patch set 2 for branch master of project Packages/TYPO3.CMS has been pushed to the review server.
It is available at https://review.typo3.org/c/Packages/TYPO3.CMS/+/66671

Patch set 1 for branch 10.4 of project Packages/TYPO3.CMS has been pushed to the review server.
It is available at https://review.typo3.org/c/Packages/TYPO3.CMS/+/66752