diff --git a/spec/unit/room.spec.ts b/spec/unit/room.spec.ts
index f2c7aee2b27..5ddda62d71f 100644
--- a/spec/unit/room.spec.ts
+++ b/spec/unit/room.spec.ts
@@ -2624,11 +2624,11 @@ describe("Room", function() {
             room.setThreadUnreadNotificationCount("123", NotificationCountType.Total, 666);
             room.setThreadUnreadNotificationCount("123", NotificationCountType.Highlight, 123);
 
-            expect(room.getThreadsAggregateNotificationType()).toBe(NotificationCountType.Highlight);
+            expect(room.threadsAggregateNotificationType).toBe(NotificationCountType.Highlight);
 
             room.resetThreadUnreadNotificationCount();
 
-            expect(room.getThreadsAggregateNotificationType()).toBe(null);
+            expect(room.threadsAggregateNotificationType).toBe(null);
 
             expect(room.getThreadUnreadNotificationCount("123", NotificationCountType.Total)).toBe(0);
             expect(room.getThreadUnreadNotificationCount("123", NotificationCountType.Highlight)).toBe(0);
@@ -2636,11 +2636,11 @@ describe("Room", function() {
 
         it("sets the room threads notification type", () => {
             room.setThreadUnreadNotificationCount("123", NotificationCountType.Total, 666);
-            expect(room.getThreadsAggregateNotificationType()).toBe(NotificationCountType.Total);
+            expect(room.threadsAggregateNotificationType).toBe(NotificationCountType.Total);
             room.setThreadUnreadNotificationCount("123", NotificationCountType.Highlight, 123);
-            expect(room.getThreadsAggregateNotificationType()).toBe(NotificationCountType.Highlight);
+            expect(room.threadsAggregateNotificationType).toBe(NotificationCountType.Highlight);
             room.setThreadUnreadNotificationCount("123", NotificationCountType.Total, 333);
-            expect(room.getThreadsAggregateNotificationType()).toBe(NotificationCountType.Highlight);
+            expect(room.threadsAggregateNotificationType).toBe(NotificationCountType.Highlight);
         });
     });
 
@@ -2669,6 +2669,37 @@ describe("Room", function() {
         });
     });
 
+    describe("threadsAggregateNotificationType", () => {
+        it("defaults to null", () => {
+            expect(room.threadsAggregateNotificationType).toBeNull();
+        });
+
+        it("counts multiple threads", () => {
+            room.setThreadUnreadNotificationCount("$123", NotificationCountType.Total, 1);
+            expect(room.threadsAggregateNotificationType).toBe(NotificationCountType.Total);
+
+            room.setThreadUnreadNotificationCount("$456", NotificationCountType.Total, 1);
+            expect(room.threadsAggregateNotificationType).toBe(NotificationCountType.Total);
+
+            room.setThreadUnreadNotificationCount("$123", NotificationCountType.Highlight, 1);
+            expect(room.threadsAggregateNotificationType).toBe(NotificationCountType.Highlight);
+
+            room.setThreadUnreadNotificationCount("$123", NotificationCountType.Highlight, 0);
+            expect(room.threadsAggregateNotificationType).toBe(NotificationCountType.Total);
+        });
+
+        it("allows reset", () => {
+            room.setThreadUnreadNotificationCount("$123", NotificationCountType.Total, 1);
+            room.setThreadUnreadNotificationCount("$456", NotificationCountType.Total, 1);
+            room.setThreadUnreadNotificationCount("$123", NotificationCountType.Highlight, 1);
+            expect(room.threadsAggregateNotificationType).toBe(NotificationCountType.Highlight);
+
+            room.resetThreadUnreadNotificationCount();
+
+            expect(room.threadsAggregateNotificationType).toBeNull();
+        });
+    });
+
     it("should load pending events from from the store and decrypt if needed", async () => {
         const client = new TestClient(userA).client;
         client.crypto = {
diff --git a/src/models/room.ts b/src/models/room.ts
index 202ef728534..de285dca78f 100644
--- a/src/models/room.ts
+++ b/src/models/room.ts
@@ -201,7 +201,6 @@ export class Room extends ReadReceipt<RoomEmittedEvents, RoomEventHandlerMap> {
     private txnToEvent: Record<string, MatrixEvent> = {}; // Pending in-flight requests { string: MatrixEvent }
     private notificationCounts: NotificationCount = {};
     private readonly threadNotifications = new Map<string, NotificationCount>();
-    private roomThreadsNotificationType: NotificationCountType | null = null;
     private readonly timelineSets: EventTimelineSet[];
     public readonly threadsTimelineSets: EventTimelineSet[] = [];
     // any filtered timeline sets we're maintaining for this room
@@ -1251,22 +1250,6 @@ export class Room extends ReadReceipt<RoomEmittedEvents, RoomEventHandlerMap> {
 
         this.threadNotifications.set(threadId, notification);
 
-        // Remember what the global threads notification count type is
-        // for all the threads in the room
-        if (count > 0) {
-            switch (this.roomThreadsNotificationType) {
-                case NotificationCountType.Highlight:
-                    break;
-                case NotificationCountType.Total:
-                    if (type === NotificationCountType.Highlight) {
-                        this.roomThreadsNotificationType = type;
-                    }
-                    break;
-                default:
-                    this.roomThreadsNotificationType = type;
-            }
-        }
-
         this.emit(
             RoomEvent.UnreadNotifications,
             notification,
@@ -1278,8 +1261,16 @@ export class Room extends ReadReceipt<RoomEmittedEvents, RoomEventHandlerMap> {
      * @experimental
      * @returns the notification count type for all the threads in the room
      */
-    public getThreadsAggregateNotificationType(): NotificationCountType | null {
-        return this.roomThreadsNotificationType;
+    public get threadsAggregateNotificationType(): NotificationCountType | null {
+        let type: NotificationCountType | null = null;
+        for (const threadNotification of this.threadNotifications.values()) {
+            if ((threadNotification.highlight ?? 0) > 0) {
+                return NotificationCountType.Highlight;
+            } else if ((threadNotification.total ?? 0) > 0 && !type) {
+                type = NotificationCountType.Total;
+            }
+        }
+        return type;
     }
 
     /**
@@ -1287,7 +1278,6 @@ export class Room extends ReadReceipt<RoomEmittedEvents, RoomEventHandlerMap> {
      * Resets the thread notifications for this room
      */
     public resetThreadUnreadNotificationCount(): void {
-        this.roomThreadsNotificationType = null;
         this.threadNotifications.clear();
     }