Visibility not respected when generating factory methods for UnionType

[ax0l0tl]

Reproduce:

static class Outer
{
 [UnionType(CaseOrder = CaseOrder.AsDeclared)]
 public partial record InitResult
 {
   public record Sync_ : InitResult;
   public record OneTimeSync_(string TempRepoFolder) : InitResult;
   public record NoSync_() : InitResult;
 }
}

Partial record type is generated with public visibiltiy but should be internal.