Buying a "masterworks" item as Ornn zeros out custom itemset

Pretty much title. I upgraded Redemption to Salvation (while dead), and the whole item set went blank. I could switch to other custom item sets (albeit with extreme FPS spikes for no apparent reason), but the one I was using were blank for the remainder of the game.

I also got a ~2 second 3 FPS spike (down from steady 170 FPS) when changing itemset after this occured - down from 170 to 70 FPS whenever the shop is open, yes, but nothing like this.

Been using the same set for Ornn for a long time, and I have never experienced this one before.