I believe there is a bug with Clown Crew Biancaviso's effect: "Once per turn, during your opponent's Main Phase, you can (Quick Effect): Immediately after this effect resolves, Tribute Summon 1 monster." Currently it does not give the option to tribute set, it assumes the monster is to be summoned face-up. As the effect is worded identical to Spell Card "Soul Exchange", it should give the same option to tribute summon in face-up attack or tribute set in face-down defense position.
Replay: https://duelingnexus.com/replay/bfcf55c2-9aff-4fd6-ac2b-408272dbc651