How does Minimserver build the upnp:AlbumArtURI property for content directories?

[usery]

I ask, because Minimserver is applying the wrong AlbumArtURI for a bunch of directories from my Windows10-based NAS. Here's the part of the directory structure that gets the wrong property:

<Multi-cd box set folder name>
---- folder.jpg
---- cd1
-------- folder.jpg
-------- <track1 name>.flac
-------- <track2 name>.flac
-------- .
-------- .
-------- .
---- cd2
-------- folder.jpg
-------- <track1 name>.flac
-------- <track2 name>.flac
-------- .
-------- .
-------- .
---- cd3
---- cd4
---- cd5
.
.
.
---- cd33

Of course, each folder.jpg has unique image content corresponding to its specific parent directory.

The AlbumArtURI property is correct for directories cd1 and cd2 - but it's wrong for all following directories, cd3 through cd33. Basically Minimserver is applying the upnp:AlbumArtURI property for cd2 to all following directories. So I get the wrong album art in my control point app (upplay) and on the renderer (Yamaha RX-V485) during playback for those directories.

Anyone know what up?

Thanks,
pete