Issue with expand+select on nullable property of a DTO

The GET of my OData controller return basically something like this:

var customers = (from customer in _companyDbContext.CustomerEntities
                 select new CustomerDto
                 {
                     Id = customer.Id,
                     Code = customer.Code,
                     Warehouse = customer.Warehouse == null ? null : new WarehouseDto
                     {
                         Id = customer.Warehouse.Id,
                         Code = customer.Warehouse.Code
                     }
                 });

It does not return EF Core entities directly. We create a CustomerDto, containing a WarehouseDto which can be null.

When i do $expand=warehouse($select=id) i get the following error:

Rewriting child expression from type 'System.Int32' to type 'System.Nullable`1[System.Int32]' is not allowed, because it would change the meaning of the operation. If this is intentional, override 'VisitUnary' and change it to allow this rewrite.

I can avoid the issue by changing the type of WarehouseDto.Id from int to int?. So, i will go with this workaround for now.

For info, i don't get the issue when i don't have to check for null.

var customers = (from customer in _companyDbContext.CustomerEntities
                 select new CustomerDto
                 {
                     Id = customer.Id,
                     Code = customer.Code,
                     WarehouseDto = new Warehouse
                     {
                         Id = customer.Warehouse.Id,
                         Code = customer.Warehouse.Code
                     }
                 });

But when the column contains a null, it give me an "Nullable object must have a value" error.

I have another workaround without changing WarehouseDto.Id from int to int?.
I introduce an intermediary let variable.

var customers = (from customer in _companyDbContext.CustomerEntities
                 let warehouse = new WarehouseDto
                 {
                     Id = customer.Warehouse == null ? 0 : customer.Warehouse.Id,
                     Code = customer.Warehouse.Code
                 }
                 select new CustomerDto
                 {
                     Id = customer.Id,
                     Code = customer.Code,
                     Warehouse = warehouse.Id == 0 ? null : warehouse
                 });

I played with [EnableQuery(HandleNullPropagation = HandleNullPropagationOption.True)], True or False and i don't get much difference.

It works with $expand=warehouse($select=*)
I use AspNetCore.OData 8.0.1 and EFCore 5.0.7.

Start by reproducing the DTO projection from the issue with AspNetCore.OData 8.0.1 and EFCore 5.0.7, using $expand=warehouse($select=id) and a nullable Warehouse. Compare the failing nullable-property rewrite with the working workarounds and HandleNullPropagation settings. Done means the projection supports the selected nullable navigation property without the rewrite or nullable-value exception while preserving null results.