I have also been experiencing this issue with our program. We noticed this started happening as early as May of 2022. Here's what I've noticed:

• If the Bill is entered after I enter the Item Receipt, the PO is NOT on the list of "Select Related Transactions". 
• If the Bill is entered before I enter the Item Receipt, the PO IS on the list of "Select Related Transactions". 

I agree something is massively amiss. This has caused all of our POs for the last 8 months to show line items as Received, but not "on bills". I've called customer support 6 times and still do not have a clear answer about this bug. One rep said this was part of some update, but my gut tells me otherwise. The PO always used to be available to enter a bill against no matter when the item receipt was entered. I've verified/rebuilt data dozens of times with no errors.

Customer support has also recommended I use the Tool Hub to run the tool doctor. We are hosted through Right Networks, so at first chat with them when trying to download the Tool Hub app, they said they can't download the app onto our remote desktop. However, the Right Networks rep downloaded our company file and ran it through the Tool Hub himself and again, showed no errors.

I don't know how to get this resolved.