Got another bug this time for the Konosuba Movie
"Droopy Temptation" Sylvia
[AUTO] [(2) Put 1 card from your hand into your waiting room & Put 2 "Devil King Army" characters from your waiting room face up in any order underneath this card as markers]
When this card becomes [REVERSE] in battle, you may pay the cost. If you do, choose 1 ""Synthesis With the Mage Killer" Sylvia" in your waiting room, put it on the position that this card is on as [REST], and put this card and all markers underneath this card face up in any order underneath that ""Synthesis With the Mage Killer" Sylvia" as markers.
I paid for the cost and removed one card from my hand, but it leaves me in a state where it tells me to choose 2 cards to put under "Droopy Temptation" Sylvia as a marker, but it doesn't open up the Waiting Room for me to select those two cards.