Update the RoomInfo since it might have come from the cache

roomserver/internal/input/input_latest_events.go

@@ -204,6 +204,12 @@ func (u *latestEventsUpdater) doUpdateLatestEvents() error {
 		return fmt.Errorf("u.updater.MarkEventAsSent: %w", err)
 	}
 
+	// Since it's entirely possible that this types.RoomInfo came from the
+	// cache, we should make sure to update that entry so that the next run
+	// works from live data.
+	u.roomInfo.IsStub = false
+	u.roomInfo.StateSnapshotNID = u.newStateNID
+
 	return nil
 }