Most /modules/* URLs are not rendered with fastboot

[yads]

I've noticed a difference between pages like https://api.emberjs.com/ember/release/classes/application/ and https://api.emberjs.com/ember/release/modules/@ember%2Fapplication

The former has the pre rendered HTML response, however, the latter does not and requires Ember to bootup and render the page. This is more of a question as to why this difference? The reason I am asking is because I maintain the Ember docs in devdocs.io (https://github.com/freeCodeCamp/devdocs) and this is causing most of the documentation to not be processed. Devdocs works by scraping the HTML. In the cases of the modules URLs the response is missing the pre-rendered HTML and the scraper is unable to get any of the documentation. This used to work, but has changed in the last 1-2 years.

I don't know fastboot very well so I'm not sure where to start investigating this, but until this is fixed I will be unable to add documentation for 5.x and update the 4.x documentation to the latest.