Genre tag... disappeared

[Gdg]

... well, rescanning ended and I've been lucky, since I didn't lost the genre tag for the untouched files.
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So here is what I'm talking about.
Untouched track, in the original place:
   
here is what I see on JPLAY (by folder navigation)
   

here the track was just copied to a new folder:
   
and... no more Genre