I'm using the aws-swf-build-tools (1.1) and have encountered an issue with the ActivityWorker class. Specifically, after setting a custom identity using the setIdentity method, the identity field in the activity start event (activityTaskStartedEventAttributes) still shows the default value (i.e., pid@host) rather than the custom value. I've confirmed that setIdentity is being invoked properly, yet the custom identity does not appear to be applied. Is this expected behavior, or has anyone experienced this issue before? Any insights, workarounds, or guidance on how to ensure the custom identity is correctly reflected would be greatly appreciated.