It actually dropped for you last week if it didn't seem like it. It is bugged in the collection preventing it from being equipped. The reason it seemed like you couldn't pick it up was because there were double drops, and one got picked up, but the 2nd one couldn't get picked up since the shader was already picked up. DMG, one of the community managers tweeted about it: https://x.com/A_dmg04/status/1849905827760701572