odata.bind and required properties

When creating an entity and using the OData clients SetLink to establish a link to another entity, the linked entity only contains its id. Values for required properties are missing, thus making model state invalid

public class TestA
{
     public int Id { get; set; }
     public TestB B { get; set; }
}

public class TestB
{
    public int Id { get; set; }
    [Required]
    public string Value { get; set; }
}

IEnumerable<TestB> bs = context.TestBs.Execute();
TestA a = new();
context.AddToTestAs(a);
context.SetLink(a, nameof(TestA.B), bs.First());
context.SaveChanges();

Posted data:
{"@odata.type":"#Test.TestA","Id":0,"B@odata.bind":"http://localhost:56168/api/TestBs(1)"}

Start by reproducing the supplied TestA/TestB example with OData client SetLink and SaveChanges, then trace how the linked entity is represented in the posted OData payload. Check how required properties and model state are handled when only an id is available. Done means the reproduction no longer produces the reported invalid model state, with coverage for the SetLink scenario.