I don’t know if this was supposed to be patched but I still can’t use etc in a 30 card deck it won’t let me put cards in it the band I’m on an Apple iPad Pro same with my iPhone as well.
Same issue here on Apple devices.
ETC has to be the first card in my deck to add the band, but then I can’t shuffle anything in or out or add ETC band to any existing deck I want to swap around.