TYPO3 Core

reason the change in DatabaseRecordList line 1109

previously

$dbCount = $queryResult->rowCount();

now

$dbCount = $queryBuilder
                                        ->count('uid')
                                    ->execute()
                                    ->fetchColumn(0)

Had this problem too (clean Typo3 9.3.3) with a custom record type and can confirm that it's fixed with the patch.

Thanks!