Telegram can't detect FLAC music cover and will try to fetch it from iTunes, but it will fetch the wrong image.
This is the exact code block that will fail in detecting music cover: https://github.com/DrKLO/Telegram/blob/4a8efef9d0e86b3b8f908d3600244f2409a603af/TMessagesProj/src/main/java/org/telegram/ui/Cells/AudioPlayerCell.java#L135 This is where it will set the iTunes API: https://github.com/DrKLO/Telegram/blob/4a8efef9d0e86b3b8f908d3600244f2409a603af/TMessagesProj/src/main/java/org/telegram/messenger/MessageObject.java#L8811
Telegram Android 10.8.3 (44079), Samsung Galaxy S9, 10 Q (29)
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https://pastebin.com/raw/Fm3fEtmB