playlist icon refresh with rescan not working

[MiniMe]

Hi Simon,

I've a folder "playlist" wherein I store .m3u playlist and never had a folder.jpg cover art in the folder.

Now that I put a (first) folder.jpg there I rescanned the lib. All apps then properly showed this (first) folder art for the playlist.

However, I changed then the (first) folder.jpg for a (second) folder.jpg and found that the (second) folder.jpg is not fully pushed to all apps.

I can see it properly in iPhone 8player app, but somehow I cannot see it in Linn Kazoo on Mac and this keeps showing the (first) folder.jpg)

I think it's a small bug in either of the app, or in Minimserver? Any case, I'd just like to let it know in case it helps with further improvement.