TYPO3 Core

The issue is part of this code:

        $this->pidOfPageRecord = $table === 'pages' && MathUtility::canBeInterpretedAsInteger($row['uid']) ? (int)$row['uid'] : (int)$row['pid'];
        BackendUtility::fixVersioningPid($table, $row);
        $this->pidOfVersionedMotherRecord = (int)$row['pid'];

However, as a workspace can also have a negative value (-1) I guess it is necessary to check if new and if pidOfPageRecord is not different from pidOfVersionedMotherRecord before calling getPagesTSconfig

This is also an issue with RTE tsconfig for linkhandler as the same value (pidOfPageRecord) is passed on to the LinkHandler.