Hello,
I made the mistake of deleting my Chivalric Fire one night when trying to clear up my power weapons slot, thinking I could just grab it again from Collections. Unfortunately, it is unable to be reacquired, as the game considers it a randomly rolled weapon.
I did not see this listed as an issue in the Known Issues or the TWABs (TWIDs) so I posted it here for visibility so this can be looked at. I still need to finish the gilded triumph for Deadeye for the ritual weapon kills xD