Oh great, we get shadowlands APIs that removed SetBackdrop that every classic era addon was using. Can’t even move there are so many lua errors. Doubting things get updated by developers on a client that 100 people use either Why would you not just deprecate the API call for the classic client and leave it in place? Very doubtful people will support this and these add-ons will be lost until others fork them now.
Edit: You also broke the usable items checkbox on the AH. It displays recipes already learned. In the past it would not display learnable recipes if already known.