wintry kernel
The Sixth Sense Joker has a bug in which the effect does not take place against "The Psychic" boss, which has a rule that you must play 5 cards.
Selecting a single card produces the text "Hand will not score / Must play 5 cards"
The Sixth Sense Joker's description states "If first hand of round is a single 6, destroy it and create a Spectral card". It does not say that the hand has to be scored, as many other jokers specifically state, so it should always have the associated effect be done when the stated condition is met, regardless of whether the hand is considered to be "valid" or not.
If this behavior is intended, could something change to make it clearer that no effect will happen against this boss?