Genre tag... disappeared

[Gdg]

Hi Simon,
today, in the morning, I moved some of my albums from a folder to another on my NAS. After the rescan, well, non more Genre info for these anymore...
And this happens, too, for new albums or modified albums during the last week.
But I can still see the Genre with untouched albums.
I checked this with all my controller apps:
. JPLAY native engine
. JPLAY by Minimiserver folder
. Foobar2000 (with Windows 10 or IOS 26.x)
. Linn (both under Android or IOS)
. MConnect.
. Volumio

No errors found in the minimserver.log.
Pretty sure everything worked fine a week ago (doing some music maintenance on saturday mornig).
Thank you for your help