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That thread does not contain mention of the specific issue I raised, but @Sukanta_Biswas' reply that the game has had several problems lately is helpful and I suspect it could be related. So, thank you @kiara_wael
To update, I'm now unable to play on mobile at all. As soon as I open the game, the Chocolate Box's grayed out Continue button now appears right away. I urge you to elevate this matter to King ASAP.