Marble Joker Undiscoverable

[muted kestrel]

I have unlocked the marble joker and have used it multiple times, but it still remains undiscovered in the Collection. I believe the issue may be that I first used it during a challenge run and that got rig of the undiscovered tag when in-game, but didn't update the Collection due to Challenge runs not counting for it,

[static jetty]

Challenges and seeded runs don't count for collection - if you have found it and bought it in an unseeded run, then it may just be broken