Whenever borrowing a chord results in an altered chord extension, the accidentals in the roman numeral are displayed as # and b instead of ♯ and ♭. Here are some examples:
Thank you for bringing this up. It should be fixed after the next update.
Regards!
Dennis
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Thanks for the quick fix! I found some more of these. It happens when the target of an applied chord is on a non-diatonic scale degree.