protected function initializeDbMountpointsInWorkspace()
    {
        $dbMountpoints = trim($this->workspaceRec['db_mountpoints'] ?? '');
        if ($this->workspace > 0 && $dbMountpoints != '') {
            $filteredDbMountpoints = [];
            // Notice: We cannot call $this->getPagePermsClause(1);
            // as usual because the group-list is not available at this point.
            // But bypassing is fine because all we want here is check if the
            // workspace mounts are inside the current webmounts rootline.
            // The actual permission checking on page level is done elsewhere
            // as usual anyway before the page tree is rendered.
            $readPerms = '1=1';
            // Traverse mount points of the
            
            // PATCH begin
            $wsWebmounts = implode(',', GeneralUtility::intExplode(',', $this->workspaceRec['db_mountpoints']));
            
            $userMounts = $this->dataLists['webmount_list'];
            
            $wsArr = GeneralUtility::intExplode(',', $wsWebmounts);
            $userArrTemp = GeneralUtility::intExplode(',', $userMounts);
            $userArr = array();
            if (is_array($userArrTemp) && count($userArrTemp) > 0) {
                foreach ($userArrTemp as $userPage) {
                    $rL = BackendUtility::BEgetRootLine($userPage);
                    if (is_array($rL) && count($rL)) {
                        $rPages = array();
                        foreach ($rL as $rPage)
                            $rPages[] = $rPage['uid'];
                            if (is_array($wsArr) && count($wsArr) > 0) {
                                
                                $valore = array(
                                    $wsArr[0]
                                );
                                if (is_array($rPages) && in_array($rPages, $valore)) {
                                    $userArr[] = $userPage;
                                }
                            }
                    }
                }
                $resultArr = array_unique(array_merge($userArr, array_intersect($wsArr, $userArrTemp)));
                $webmountUidList = implode(',', $resultArr);
            }
            
            $dbMountpoints = GeneralUtility::intExplode(',', $webmountUidList);
            
            foreach ($dbMountpoints as $mpId) {
                if ($mpId > 0 && $this->isInWebMount($mpId, $readPerms)) {
                    $filteredDbMountpoints[] = $mpId;
                }
            }
            // PATCH end
            
            // Re-insert webmounts:
            $filteredDbMountpoints = array_unique($filteredDbMountpoints);
            $this->groupData['webmounts'] = implode(',', $filteredDbMountpoints);
        }
    }