Album artwork impacted by .AppleDouble sub folders on NAS

[TheOldPresbyope]

I'm confused. I don't have any OS X dotted files in my copy of the zip file.

Code:

(on a Linux box---note cockamamie glyphs displayed for some characters. The code points are correct.)
kreed@T520 ~/Downloads/MoodeAudio/audiobeer $ unzip -t moodeaudio-debug.zip
Archive:  moodeaudio-debug.zip
   testing: Runaljod - Gap Var Ginnunga/   OK
   testing: Runaljod - Gap Var Ginnunga/01 - ╡r Var Alda.flac   OK
   testing: Runaljod - Gap Var Ginnunga/02 - Hagal.flac   OK
   testing: Runaljod - Gap Var Ginnunga/03 - Bjarkan.flac   OK
   testing: Runaljod - Gap Var Ginnunga/04 - LЫyndomsriss.flac   OK
   testing: Runaljod - Gap Var Ginnunga/05 - Heimta Thurs.flac   OK
   testing: Runaljod - Gap Var Ginnunga/06 - Thurs.flac   OK
   testing: Runaljod - Gap Var Ginnunga/07 - Jara.flac   OK
   testing: Runaljod - Gap Var Ginnunga/08 - Laukr.flac   OK
   testing: Runaljod - Gap Var Ginnunga/09 - Kauna.flac   OK
   testing: Runaljod - Gap Var Ginnunga/10 - Algir - Stien Klarnar.flac   OK
   testing: Runaljod - Gap Var Ginnunga/11 - Algir - Tognatale.flac   OK
   testing: Runaljod - Gap Var Ginnunga/12 - Dagr.flac   OK
   testing: Runaljod - Gap Var Ginnunga/cover.jpg   OK
   testing: Runaljod - Gap Var Ginnunga/extra/   OK
   testing: Runaljod - Gap Var Ginnunga/extra/Runaljod - Gap Var Ginnunga.cue   OK
   testing: Runaljod - Gap Var Ginnunga/extra/Runaljod - Gap Var Ginnunga.log   OK
   testing: Runaljod - Gap Var Ginnunga/folder.jpg   OK
   testing: Runaljod - Gap Var Ginnunga/Runaljod - Gap Var Ginnunga.lfml   OK
   testing: Runaljod - Gap Var Ginnunga/Thumbs.db   OK
No errors detected in compressed data of moodeaudio-debug.zip.

What I do have when moOde 6.4.2 with debug logging scans the resulting directory is

Code:

20200412 113934 coverart: flac: /var/lib/mpd/music/NAS/OMV-Test2/audiobeer/Runaljod - Gap Var Ginnunga/01 - µr Var A
lda.flac
20200412 113934 coverart: flac: Zend media exception: Not a valid FLAC bitstream

Whereas neither file nor mediainfo have a problem with the flac files.

On moOde 6.4.2, the album thumbart doesn't appear in the tags view but the cover appears on all views.

Need to scratch my head on this one.

Regards,
Kent