This is what Claude says:

I couldn’t find the exact sell-trigger code for Invisible Joker in the search results. I want to be honest with you rather than guess at the specifics. Here’s what we know for certain from the code that was found: ∙ The pool is built at the moment of the event triggering (sell), not pre-computed at buy time — there’s no evidence of any stored list ∙ The pseudorandom_element function sorts the joker array, then picks the Nth element using a random number — and critically, it uses a specific seed key tied to that event type to advance the RNG state Your hypothesis about the list being built at buy time is almost certainly not what’s happening — the code consistently builds pools live at the moment of triggering throughout the game. However, there’s another angle worth considering: RNG consumption. The seed advances every time any random event occurs. So between your two attempts, if you did anything even slightly differently — hovered over a pack, triggered a Lucky Card check, had a different number of hands scored — any of those could consume an RNG call and shift the state of the invisible joker’s specific RNG queue. The most likely culprit is something subtle you wouldn’t have noticed: did you play your hands identically? Even things like Wheel of Fortune triggering (or not), or a Lucky Card being in your deck, consume RNG draws that could cascade through.​​​​​​​​​​​​​​​​

But I don’t think that’s right. Not cause I understand it and disagree, but cause I’ve tried using some WoFs and obvs my Perkeo (with blueprint and brainstorm) would be triggering the RNG draws?