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client/src/pages/TutorialTasks.tsx

@@ -77,6 +77,7 @@ const TutorialTasks: React.FC = () => {
   const submissionsGridRefs = useRef<{[key: string]: HTMLDivElement | null}>({});
   const submissionsContainerRefs = useRef<{[key: string]: HTMLDivElement | null}>({});
   const withPreservedScroll = useRef<(fn: () => void) => void>();
+  const pendingUnlocksRef = useRef<Set<string>>(new Set());
 
   const setGlobalAnchorDisabled = (disabled: boolean) => {
     try {
@@ -911,13 +912,29 @@ const TutorialTasks: React.FC = () => {
             setTranslationText({ ...translationText, [taskId]: '' });
             setSelectedGroups({ ...selectedGroups, [taskId]: 0 });
             // Narrow refetch: only this task's submissions
+            pendingUnlocksRef.current.add(taskId);
             api.get(`/api/submissions/by-source/${taskId}`).then(r => {
               const list = (r.data && r.data.submissions) || [];
               setUserSubmissions(prev => ({ ...prev, [taskId]: list }));
               // Release spacer one frame after list update to avoid jump
-              requestAnimationFrame(() => setSpacerHeights(prev => ({ ...prev, [taskId]: 0 })));
+              requestAnimationFrame(() => {
+                setSpacerHeights(prev => ({ ...prev, [taskId]: 0 }));
+                // Now that the grid has the final height, safely unlock
+                unlockListHeight();
+                unlockCardHeightById(taskId);
+                unlockGridHeightById(taskId);
+                pendingUnlocksRef.current.delete(taskId);
+                if (isSafari) { unfreezeScroll(); }
+              });
             }).catch(() => {
-              requestAnimationFrame(() => setSpacerHeights(prev => ({ ...prev, [taskId]: 0 })));
+              requestAnimationFrame(() => {
+                setSpacerHeights(prev => ({ ...prev, [taskId]: 0 }));
+                unlockListHeight();
+                unlockCardHeightById(taskId);
+                unlockGridHeightById(taskId);
+                pendingUnlocksRef.current.delete(taskId);
+                if (isSafari) { unfreezeScroll(); }
+              });
             });
           });
         });
@@ -933,6 +950,8 @@ const TutorialTasks: React.FC = () => {
       });
       // release after a couple frames to let DOM settle (extra frame on Safari)
       const release = () => {
+        // If a gated refetch is in-flight, defer unlock until postRefetch block
+        if (pendingUnlocksRef.current.has(taskId)) return;
         unlockListHeight();
         unlockCardHeightById(taskId);
         unlockGridHeightById(taskId);