message: Clone reads of account data to prevent mutation
diff: @@ -162,7 +162,7 @@ export default class AccountSettingsHandler extends MatrixClientBackedSettingsHa
  const event = cli.getAccountData(eventType);
  if (!event || !event.getContent()) return null;
  - return event.getContent();
  + return JSON.parse(JSON.stringify(event.getContent())); // clone to prevent mutation
  }
  _notifyBreadcrumbsUpdate(event) {
  