Sparse fieldsets returning all fields

[arthurpankiewicz]

Describe the bug
Querying by sparse fieldsets is not behaving as expected. When trying to specify multiple fields for one resource, it does not work (all fields are returned). It works if you specify the multiple fields for the one resource across multiple query params.

• does not work, but should: [resource1]=field1,field2,field3
• workaround: [resource1]=field1&[resource1]=field2&[resource1]=field3

To Reproduce
Use the fields parameter with useAll or useDataGridState, it will structure the query in the jsonapi format, but the request will return all fields regardless.

Expected behavior
Using the jsonapi URL format returns only specified fields.

[kt-mattie-langenberg]

Hi folks! I can add some additional detail. This bug only shows up on included schemas. It behaves as expected on the base schema but fails to parse on the inlcuded schemas.