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client/src/pages/TutorialTasks.tsx

@@ -323,7 +323,7 @@ const TutorialTasks: React.FC = () => {
         // throttle fetch during and just after mutations to avoid reflow interference
         if (mutatingTaskId) {
           try { console.log('[Trace] Docs:skipDuringMutate', { weekNumber, mutatingTaskId }); } catch {}
-          setTimeout(() => { if (!mutatingTaskId) loadDocs(); }, 400);
+          setTimeout(() => { if (!mutatingTaskId) loadDocs(); }, 600);
           return;
         }
         if (isDocsFetchInFlightRef.current) {
@@ -1146,27 +1146,33 @@ const TutorialTasks: React.FC = () => {
     }
     // let DOM settle then unlock (both list and card if id known)
     requestAnimationFrame(() => requestAnimationFrame(() => {
-      unlockListHeight();
-      if (taskId) {
-        unlockCardHeightById(taskId);
-        unlockGridHeightById(taskId);
-      }
-      if (isSafari) { 
-        if (SAFARI_FREEZE_ENABLED) unfreezeScroll();
-        // Safari: delay per-task refetch until after unlock to avoid visible reflow
+      if (isSafari && taskId) {
+        // Hold locks until per-task refetch completes
+        pendingUnlocksRef.current.add(taskId);
+        setTimeout(() => {
+          api.get(`/api/submissions/by-source/${taskId}`).then(r => {
+            const list = (r.data && r.data.submissions) || [];
+            setUserSubmissions(prev => ({ ...prev, [taskId]: list }));
+          }).catch(() => {}).finally(() => {
+            unlockListHeight();
+            unlockCardHeightById(taskId);
+            unlockGridHeightById(taskId);
+            if (SAFARI_FREEZE_ENABLED) unfreezeScroll();
+            pendingUnlocksRef.current.delete(taskId);
+            try {
+              const el = cardRefs.current[taskId];
+              const topAfter = el ? el.getBoundingClientRect().top : null;
+              console.log('[Trace] ScrollPreserve(del):after', { taskId, topAfter });
+            } catch {}
+          });
+        }, 300);
+      } else {
+        unlockListHeight();
         if (taskId) {
-          setTimeout(() => {
-            api.get(`/api/submissions/by-source/${taskId}`).then(r => {
-              const list = (r.data && r.data.submissions) || [];
-              setUserSubmissions(prev => ({ ...prev, [taskId]: list }));
-              try {
-                const el = cardRefs.current[taskId];
-                const topAfter = el ? el.getBoundingClientRect().top : null;
-                console.log('[Trace] ScrollPreserve(del):after', { taskId, topAfter });
-              } catch {}
-            }).catch(() => {});
-          }, 300);
+          unlockCardHeightById(taskId);
+          unlockGridHeightById(taskId);
         }
+        if (isSafari && SAFARI_FREEZE_ENABLED) { unfreezeScroll(); }
       }
       setMutatingTaskId(null);
     }));