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src/views/InstructorView.js

@@ -491,8 +491,12 @@ export function setupInstructorEvents() {
 
             subscribeToRoom(inputCode, async (data) => {
                 const users = Array.isArray(data) ? data : (data?.users ? Object.values(data.users) : []);
+                currentStudents = users; // Sync module-level variable
+
                 if (typeof window.renderTransposedHeatmap === 'function') {
                     window.renderTransposedHeatmap(users);
+                } else if (typeof renderTransposedHeatmap === 'function') {
+                    renderTransposedHeatmap(users);
                 }
             });
         } catch (e) {