Chestienut: Okay so update:
The new 1.5(.1?) DLSS patch came out and downloading it seems to have fixed the problem for me.
The size of the this patch on GoG is inexplicably 62GB so it might take a bit to download, but when I had it installed, I was able to receive my rewards. The new Black Unicorn is gorgeous TT-TT
I also came upon another lad on the CDPR support forums who's had the same problem, and a full reinstall did the trick for him.
I can't guarantee if this fixes it for everybody, but it did for me so hoping it does for you as well.
my issue started *after* the 1.5.1 patch. guess i'll try reinstalling.