TYPO3 Core

This error is also present in Version 11.5.22. Please have a look on it.

Example

$TCA['fe_users']['columns']['subgroup'] = [
    'exclude' => true,
    'label' => 'LLL:EXT:frontend/Resources/Private/Language/locallang_tca.xlf:fe_groups.subgroup',
    'config' => [
        'type' => 'select',
        'renderType' => 'selectTree',
        'foreign_table' => 'fe_groups',
        'foreign_table_where' => 'ORDER BY fe_groups.sorting',
        'size' => 35,
        'autoSizeMax' => 10,
        'maxitems' => 500,
        'treeConfig' => [
            'dataProvider' => 'Vendor\\ExtensionNameSpace\\Tree\\TableConfiguration\\GroupTreeDataProvider',
            'childrenField' => 'subgroup',
            'appearance' => [
                'showHeader' => true,
                'expandAll' => true,
                'maxLevels' => 10,
            ],
        ],
        'minitems' => 0,
    ],
];

Fix:
\typo3\sysext\core\Classes\Tree\TableConfiguration\DatabaseTreeDataProvider.php LINE 511

OLD: if ($this->columnConfiguration['MM']) {
NEW: if (!empty($this->columnConfiguration['MM'])) {

\typo3\sysext\core\Classes\Tree\TableConfiguration\DatabaseTreeDataProvider.php LINE 522

OLD: } elseif ($this->columnConfiguration['foreign_field']) {
NEW: } elseif (!empty($this->columnConfiguration['foreign_field'])) {

Patch set 2 for branch main of project Packages/TYPO3.CMS has been pushed to the review server.
It is available at https://review.typo3.org/c/Packages/TYPO3.CMS/+/77560

Patch set 1 for branch 11.5 of project Packages/TYPO3.CMS has been pushed to the review server.
It is available at https://review.typo3.org/c/Packages/TYPO3.CMS/+/77572