CloudPlayer is no longer finding embedded artwork

I have been using CloudPlayer on Android for some years now, but have noticed recently that it doesn't seem to be finding my embedded artwork. I thought it was just a few of my new albums, but have reset Cloudplayer, and it is now not locating ANY embedded artwork, whereas previously it definitely used to as all my albums used to show the embedded artwork correctly.

I have 400+ albums in WMA Lossless format stored on OneDrive. I have examined the log file which contains lots of entries similar to the following:

2020.11.20 16:06:36.298 DEBUG [ArtworkService] ArtworkService - processPendingMedia: mediaId=6454
2020.11.20 16:06:36.313 ERROR [ArtworkService] OneDriveClient - item content error

There is also one entry which reads:

2020.11.20 16:12:29.282 ERROR [ArtworkService] ArtworkService - getPictureFromMediaFile error mediaId=6597
java.lang.IllegalStateException: Invalid data found when processing input
at com.doubleTwist.media.DTMediaMetadataRetriever.nativeSetDataSource(Native Method)
at com.doubleTwist.media.DTMediaMetadataRetriever.c(DT:17)
at rr$a.v(DT:2)
at rr$a.w(DT:1)
at com.doubleTwist.cloudPlayer.ArtworkService.l(DT:6)
at com.doubleTwist.cloudPlayer.ArtworkService.s(DT:12)
at com.doubleTwist.cloudPlayer.ArtworkService.r(DT:6)
at com.doubleTwist.cloudPlayer.ArtworkService.handleMessage(DT:10)
at android.os.Handler.dispatchMessage(Handler.java:98)
at android.os.Looper.loop(Looper.java:148)
at android.os.HandlerThread.run(HandlerThread.java:61)

If I choose the option to 'Edit Artwork' on any album, then it only locates online artwork, it does not show any embedded artwork. The artwork is DEFINITELY present, as the Android OneDrive app displays it correctly.

Any help appreciated. As I say, this is a new problem, so either as a result of a CloudPlayer upgrade or a change to the way OneDrive works. I have the same problem on two phones - Google Pixel 2 running Android 11 and an LG4 running Android 6.

John