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In MTI or ForeignKey as primary key cases, it is required to fetch the attname from the field instance on the remote model in order to reliably resolve the to_field_name. Backport of ceb4b9ee68dffc6ab0398886f1758f15f037c472 from main Backport of 03d0f12c823239812da21e5180aaa74dc6fd146e from main Co-authored-by: Johannes Maron <info@johanneshoppe.com> Co-authored-by: Mariusz Felisiak <felisiak.mariusz@gmail.com> Co-authored-by: Carlton Gibson <carlton.gibson@noumenal.es>