Ah, the flickering button problem surfaces again in yet another game - 4th one I think I've seen in about three weeks. I'm pretty convinced now that there's a bug that these AI coding tools are somehow trained to keep reproducing. I look forward to the day when coding becomes art, science, and engineering again, instead of prompt-and-pray. Maybe I'll be lucky enough to live to see it.
Until the author figures out the prompt to fix it, just click the button really fast - you'll probably eventually catch it during an enabled frame.