Syncing nuo-stems into traktor not working

bit of an odd issue using Nuo-stems. I convert some files in the program and send them to LXC watch folder. I then process as normal incoming files and sync with Traktor. For some reason doing it this way Traktor doesnt see the newly added tracks as stem tracks. if I add the tracks directly into Traktor it works.
Just wondering if anyone else has had similar issues?
Using 1.8.1 LXC

What kind of files are those? Lexicon handles normal audio files so could be Lexicon just ignores them

Lexicon doesn’t ignore them, it adds it to Traktor it’s just that Traktor then only sees it as a ‘normal’ m4a track rather than as a stem track. If I delete the track from lexicon and just drag it into Traktor manually it sees it as a stem track. So it definitely looks like LXC is doing something when syncing to prevent Traktor from properly identifying the track as a stems track.
NB…stem tracks are m4a containers with 4 separate tracks, the drums, bass, ‘other’ and Vox split out.

Just to add some more detail…I also tried:

  1. deleting from Lexicon collection
  2. delete from Traktor collection
  3. manual add (drag/drop) back in to Traktor collection and add to a test playlist and confirm it is seen as a stem track
  4. sync playlist from Traktor to LXC
  5. sync playlist from LXC to Traktor
  6. confirm that the track is now loaded as a standard track, not a stem track

so its not just the initial sync to Traktor that breaks things, its any subsequent with an already existing stem track too.

Let me know if you want me to share an example stem file

Can you send me one of those stem files? You can upload with this link: http://upload.lexicondj.com

done. thanks

have you been able to verify/reproduce this behaviour?