Hi there! Just checking in because I'm one of the ones (if not the only one) who brought up this bug in the first place. I don't have screenshots to verify anymore, but it's not just custom icons that are affected.
When I had issues with the bug, yes, the dyes were off in the vendor. But when I'd move the books into my inventory, my entire row of runes would disappear. I fixed this by using the book.. but then when the runes came back, my tiny toy dressing room seperator thing went missing. They were all still there but the icons were gone!
Very strange.