2.1.2 251 not shwoing embedded covers

[Manelus]

minimserver 2.1.2 215 not showing embedded covers
Cover is showed if it is only a folder.jpg in folder, but if it also has cover embedded in files (flac) it shows no image.
It worked in previous versions.
minimserver is installed in a QNAP TS 673
Control app is Mosaic (dCS).

Will it work if I purchase a license?
If not, how do I revert to a previous version?

Thanks in advance