Instance expression Expression.Default, Expression.Convert(Expression.Constant(null),typeof(DesiredObject)) fails during serialization

When Instance property in OData Container Class is patched from property to expression containing Expression.Default or Expression.Convert(Expression.Constant(null),typeof(DesiredObject)) serialization fails with the following error:
the EDM instance of type [some-type] is missing the property [some-property]
Doesnt work:

Container = new SingleExpandedProperty`1() {
Name = "Property", 
Value = new SelectAll`1() {
    Model = 
value(Microsoft.AspNetCore.OData.Query.Container.LinqParameterContainer+TypedLinqParameterContainer`1[Microsoft.OData.Edm.IEdmModel]).TypedProperty, 
    **Instance = IIF($it.Property.IsAllowed, $it.Property, default(PropertyClass)),** 
    UseInstanceForProperties = True}, 
IsNull = ($it.Property == null)}

Work:

Container = new SingleExpandedProperty`1() {
Name = "Property", 
Value = new SelectAll`1() {
    Model = 
value(Microsoft.AspNetCore.OData.Query.Container.LinqParameterContainer+TypedLinqParameterContainer`1[Microsoft.OData.Edm.IEdmModel]).TypedProperty, 
    **Instance = $it.Property,** 
    UseInstanceForProperties = True}, 
IsNull = ($it.Property == null)}

In the first example serialization fails only in the Default(PropertyClass) case

Start by reproducing the failure with the OData Container Class using Expression.Default and Expression.Convert(Expression.Constant(null), typeof(DesiredObject)), then compare it with the working direct $it.Property instance. Trace how SingleExpandedProperty and SelectAll serialize the Instance expression and identify why the default case omits an EDM property. Done means both reported expression forms serialize without the missing-property error.