I understand you and agree with what you say. I hope they can solve the problem.
If you allow me, since you mention that this affects several developers, I would like to comment that the concept of delivering a single common key does not seem like a good choice to me, because it has many risks, regardless of the possible error on the Itch website.
There are many printing companies that allow you to send them lists of URLs or codes and they generate the QR codes from those lists.
If you do it at home, with your own printer, there are several websites and applications that allow the same thing.
It is a little more work, but delivering a different key for each product is much safer and I think it would be good to mention it to the developers when they do new projects.