[BUG] Fix detection of "draft records" in workspaces

Also consider "modified placeholder records" as draft records to avoid them
being indexed and also to avoid exceptions in the backend (PHP 8) in the
garbage collector.

Resolves #3641

Classes/Util.php

@@ -114,9 +114,14 @@ public static function isDraftRecord(string $table, int $uid): bool
         $isWorkspaceRecord = false;
 
         if ((ExtensionManagementUtility::isLoaded('workspaces')) && (BackendUtility::isTableWorkspaceEnabled($table))) {
-            $record = BackendUtility::getRecord($table, $uid, 'pid, t3ver_state');
-
-            if ($record !== null && ($record['pid'] == '-1' || $record['t3ver_state'] > 0)) {
+            $record = BackendUtility::getRecord($table, $uid, 'pid, t3ver_state, t3ver_oid');
+
+            // \TYPO3\CMS\Core\Versioning\VersionState for an explanation of the t3ver_state field
+            // if it is >0, it is a draft record or
+            // if it is "0" (DEFAULT_STATE), could also be draft if t3ver_oid points to any uid (modified record)
+            if ($record !== null &&
+                ($record['pid'] == '-1' || $record['t3ver_state'] > 0 || (int)$record['t3ver_oid'] > 0)
+            ) {
                 $isWorkspaceRecord = true;
             }
         }