Ixamyakxim: It actually was working earlier. I think this is like the "Owned" tab being taken off last big sale. You wouldn't think it, but little "server checks" like this eat cycles that GoG probably needs for other things right now. So I wouldn't expect to see discount prices back, especially with a free game being given away and all the added traffic that brings.
I can understand how turning off the owned check when viewing the catalog might save site resources during a big sale, but the wishlist? That really shouldn't be much of a tax on the system. It's a interesting thought, but I don't think I buy this being intentional....