I'm not quite sure but this may be a duplicate of
https://www.drupal.org/project/jsonapi_extras/issues/3063085 β
Which is open since more than 4 years... and the
related Core bug β
also!
Maybe we could think about implementing a special case for this Resource, and lock the Resource Type field, as I suggested?
mattew β created an issue.
I submitted a first MR. Can't figured out how to make tests works (very first assertion of the module test Class failed, derivatives are not in the "file--file" json:api response, I don't know why). So I didn't wrote a test for now, sorry.
mattew β created an issue.