I just stumbled upon a deprecation notice:
[PLUGIN discourse-user-response-times] DEPRECATION NOTICE: The file ‘discourse/plugins/discourse-user-response-times/discourse/connectors/user-card-metadata/discourse-user-response-times.hbs’ uses the deprecated .hbs extension. Refactor it to use ‘.gjs’ instead. [deprecation id: discourse.hbs-extension] [info: Deprecating .hbs file extension in themes and plugins]