During the cascade brawl event, whenever I cast my very first spell of the game, there's a bug that doesn't allow me to cast whatever spell I cascaded into. As seen in the screenshot, it asks if I like to cast whatever is on the stack without paying its mana cost but doesn't actually show me what the revealed card is, and only gives me an option to resolve the original spell, despite having targets to cascade into in my deck, and thus whatever card is revealed is shuffled back into my deck. This has gone on for several games in a row, and it is a little upsetting to see my opponents get their free spell but I can't :/

EDIT: happened again about 10 minutes after I posted this report. Here is another screenshot