Glad to have found this thread. Just another user with the exact same problem with 2021 as of 3/12/2021, and can't upgrade to it until the problem is fixed.

Enter PO, receive, enter bill. Hit "Show PO" on the bill, it goes to the PO which shows 1 in the received column and 0 in the bill column. Go back to the bill again, the button has some graphical glitch and changes to "Show item receipt" instead.

We've had multiple calls with customer support, and often have trouble getting anyone to even understand what we are talking about until we get on remote support, at which point they do the same verifies and rebuilds and declare they have no idea and haven't seen this before. We had another meeting with tier 2 scheduled to call for yesterday; they never called and we've heard nothing back.

I suppose I'll spend even more time calling again and adding our company to the INV-51527 list, but it sure seems like it'll be time for the next version by the time we hear back.