Hi again,
I checked the file furthermore and “mkvmerge --identify” returns an error due too the Attachment field (value meta).
So clearly this file is not 100% correct, although it does play with VLC or other players. I suspect this could be why Kodi stops.
Anyway this an old encoding of mine so I will have to fix it. Hopefully it looks I do not have more of them.
I leave it to you if you want to work on how Kodi/osmc is dealing with this case of slightly incorrect mkv.