I just encountered this bug which caused me losing my game. Please see the log and my video recording. I cannot swap any cards between games in a bo3 draft of this Chromatic Cube event.

(No card can be added to main deck from the sideboard. Card from main deck can be "removed" but with no effect and I can't even go into the next game since it says deck is below 40 cards. The next game is automatically using the original deck.)