Bizarre issue with custom RSS template

First off, as background context, after a lot of Googling, this is the method I’ve chosen to create the RSS template. (If there’s a better approach, I’m all ears):

Second time this comes up today. 🙂 You should use add_feed() ( source ) rather emulate this stuff with page.

As for issue you describe I am not sure. If caching is involved I’d try to test stuff on separate local test installation.