Try using old mark seen method

mautrix_instagram/matrix.py

@@ -149,8 +149,8 @@ class MatrixHandler(BaseMatrixHandler):
         if not message:
             return
         user.log.debug(f"Marking {message.item_id} in {portal.thread_id} as read")
-        await user.client.mark_seen(portal.thread_id, message.item_id)
-        # await user.mqtt.mark_seen(portal.thread_id, message.item_id)
+        # await user.client.mark_seen(portal.thread_id, message.item_id)
+        await user.mqtt.mark_seen(portal.thread_id, message.item_id)
 
     @staticmethod
     async def handle_typing(room_id: RoomID, typing: list[UserID]) -> None: