Hey, I'm really sorry to hear you got this bug! I must say, in two years, no one has ever told me about this. Can you tell me exactly how it was caused? Does it only happen when you re-watch that scene with Bea and Nessa?
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Oh, I see! It's a common bug that happens when you do not have the right alphabet/keyboard installed in your PC (your PC doesn't like the accent in Pokémon, basically). There is a really simple fix. I've uploaded several fixed versions of the OST files that can cause this in the thread, so you put the files in (in BGM in the game directory), and it should work fine. You can also just rename the OST file mentioned and get rid of the 'é' in Pokémon and it should work too.