@apistoletov said in Is there a more-or-less standard convention for storing Language info in the (FLAC) tags?: On the other hand, it's somewhat common to have songs in made-up languages which wouldn't have the language code, but is there any interest in supporting them? You could use "mis", "und" or "zxx", depending on the case https://en.wikipedia.org/wiki/ISO_639-3#Generic_codes

Not sure, I've since moved away from using cuesheets (they make a number of other things inconvenient as well), and I did not ever notice anything like this when cuesheets aren't involved