I think maybe you released a bugfix for this now?
However, now, the remaining items in a Partially Added PO is not counted for as Incoming Stock.
For example I have remaining 1500 pcs. of Product A in a PO with Partially Added status. I also have another PO of 2500 pcs. with status Sent. My incoming for Product A says 2500 only. It should have been 4000.