Ideally a test in a relevant test file, there is a test somewhere for inclusion of related resources IIRC. Barring that, a separate repo with a minimal reproduction.
As for this issue, it sounds like there is some kind of mishandling of fields somewhere, like we’re passing it down when rendering related resources, or we’re using the source resource when determining default fields instead of the destination resource. My instinct is a problem somewhere in the serializer.
