Double flats are written as "♭b" in Hooktheory Trends, guitar view, and maybe elsewhere.
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Thank you very much for reporting this! I have added it to our bug list.
Regards!
Dennis
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I was able to change the double flats into a unicode 𝄫 symbol in both occasions. It might take a while until these updates will get pushed. Please let me know if you find more of those problems.
Regards!
Dennis