Some change in arguments that I can see. Taking a further look. The addon interface in LE Kodi looks right with a default of 0.0.0.0:8384
Aug 14 22:13:51 nuc12 systemctl[2790811]: Failed to stop service.system.syncthing.service: Unit service.system.syncthing.service not loaded.
Aug 14 22:13:51 nuc12 systemctl[2790813]: Failed to disable unit: Unit service.system.syncthing.service does not exist
Aug 14 22:13:51 nuc12 systemctl[2790814]: Created symlink '/storage/.config/system.d/service.system.syncthing.service' → '/storage/.kodi/addons/service.system.syncthing/system.d/service.system.syncthing.service'.
Aug 14 22:13:51 nuc12 systemctl[2790814]: Created symlink '/storage/.config/system.d/kodi.target.wants/service.system.syncthing.service' → '/storage/.kodi/addons/service.system.syncthing/system.d/service.system.syncthing.service'.
Aug 14 22:13:52 nuc12 systemd[1]: Starting service.system.syncthing.service...
Aug 14 22:13:52 nuc12 systemd[1]: Started service.system.syncthing.service.
Aug 14 22:13:52 nuc12 sh[2790904]: syncthing: error: unknown flag -o, did you mean one of "-h", "-C", "-D", "-H"?
Aug 14 22:13:52 nuc12 systemd[1]: service.system.syncthing.service: Main process exited, code=exited, status=80/n/a
Aug 14 22:13:52 nuc12 systemd[1]: service.system.syncthing.service: Failed with result 'exit-code'.
Aug 14 22:13:52 nuc12 systemd[1]: service.system.syncthing.service: Scheduled restart job, restart counter is at 1.
Aug 14 22:13:52 nuc12 systemd[1]: Starting service.system.syncthing.service...
Aug 14 22:13:52 nuc12 systemd[1]: Started service.system.syncthing.service.
Aug 14 22:13:52 nuc12 sh[2790978]: syncthing: error: unknown flag -o, did you mean one of "-h", "-C", "-D", "-H"?
Aug 14 22:13:52 nuc12 systemd[1]: service.system.syncthing.service: Main process exited, code=exited, status=80/n/a
Aug 14 22:13:52 nuc12 systemd[1]: service.system.syncthing.service: Failed with result 'exit-code'.
Aug 14 22:13:52 nuc12 systemd[1]: service.system.syncthing.service: Scheduled restart job, restart counter is at 2.
Aug 14 22:13:52 nuc12 systemd[1]: Starting service.system.syncthing.service...
Aug 14 22:13:52 nuc12 systemd[1]: Started service.system.syncthing.service.
Aug 14 22:13:52 nuc12 sh[2791028]: syncthing: error: unknown flag -o, did you mean one of "-h", "-C", "-D", "-H"?
Aug 14 22:13:52 nuc12 systemd[1]: service.system.syncthing.service: Main process exited, code=exited, status=80/n/a
Aug 14 22:13:52 nuc12 systemd[1]: service.system.syncthing.service: Failed with result 'exit-code'.
Aug 14 22:13:52 nuc12 systemd[1]: service.system.syncthing.service: Scheduled restart job, restart counter is at 3.
Aug 14 22:13:52 nuc12 systemd[1]: Starting service.system.syncthing.service...
Aug 14 22:13:52 nuc12 systemd[1]: Started service.system.syncthing.service.
Aug 14 22:13:52 nuc12 sh[2791077]: syncthing: error: unknown flag -o, did you mean one of "-h", "-C", "-D", "-H"?
Aug 14 22:13:52 nuc12 systemd[1]: service.system.syncthing.service: Main process exited, code=exited, status=80/n/a
Aug 14 22:13:52 nuc12 systemd[1]: service.system.syncthing.service: Failed with result 'exit-code'.
Aug 14 22:13:53 nuc12 systemd[1]: service.system.syncthing.service: Scheduled restart job, restart counter is at 4.
Aug 14 22:13:53 nuc12 systemd[1]: Starting service.system.syncthing.service...
Aug 14 22:13:53 nuc12 systemd[1]: Started service.system.syncthing.service.
Aug 14 22:13:53 nuc12 sh[2791127]: syncthing: error: unknown flag -o, did you mean one of "-h", "-C", "-D", "-H"?
Aug 14 22:13:53 nuc12 systemd[1]: service.system.syncthing.service: Main process exited, code=exited, status=80/n/a
Aug 14 22:13:53 nuc12 systemd[1]: service.system.syncthing.service: Failed with result 'exit-code'.
Aug 14 22:13:53 nuc12 systemd[1]: service.system.syncthing.service: Scheduled restart job, restart counter is at 5.
Aug 14 22:13:53 nuc12 systemd[1]: service.system.syncthing.service: Start request repeated too quickly.
Aug 14 22:13:53 nuc12 systemd[1]: service.system.syncthing.service: Failed with result 'exit-code'.
Aug 14 22:13:53 nuc12 systemd[1]: Failed to start service.system.syncthing.service.
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