Fetch clause suppresses where clause if positioned before Select clause

Fetch clause AFTER Select:

Linq<InvoiceItem>().Where(ii => ii.Invoice.ID == id).Select(ii => ii).Fetch(ii => ii.Product).ToList();

Leads to

select * from invoice_items invoiceite0_
inner join invoices invoice1_
on invoiceite0_.[invoice_id] = invoice1_.[invoice_id]
left outer join products product2_
on invoiceite0_.[product_id] = product2_.[product_id]
where invoice1_.[invoice_id] = 51361

-> Correct, although the join on invoices seems superfluous, as the filtering could happen on the foreign key of invoice_items.

Fetch clause BEFORE Select:

Linq<InvoiceItem>().Where(ii => ii.Invoice.ID == id).Fetch(ii => ii.Product).Select(ii => ii).ToList();

leads to

select * from invoice_items invoiceite0_ left outer join products product1_ on invoiceite0_.[product_id] = product1_.[product_id]

-> Where clause is missing!