Genre tag... disappeared

[Gdg]

Simon, I did those.
I did the JPLAY "Sync Data" (complete DATA rescan), too, even if I mostly use the MinimServer's folder navigation, with JPLAY.
I do noticed, too, that some app (Linn IOS or Android, Eversolo IOS or Android, p.e.) don't show any Genre value for the olders nor the copied tracks.
To double check the issue I activated the embedded Foobar200's "UPNP Media Server".
Using the very same album, all the apps show correctly the Genre tag, including JPLAY.