Paging bug when requesting Rubrics through the REST API?

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We have various implementations of the Canvas REST API, which we've been using for years. We recently added a version in Javascript and just finished the code to use paging using the 'next' header link. The mechanism works well and we receive the data requested.

However, for Rubrics no matter how many there are defined in a course, and no matter what we set the per_page argument to, we only get back the first 10. We tried this in our code and straight up in Postman and we keep seeing the same results.

Is this a potential bug or are we overlooking something?