Unless I'm missing something It seems that mkvtoolnix is setting wrong Default Duration for certain files with raw audio.

https://trac.bunkus.org/ticket/1001

This breaks timestamps in gstreamer since in this case default duration is used to calculate lace duration. Other players seems to handle it find (either by ignoring default duration and using block timestamp delta or possibly deriving timestamps from the raw audio data).

Should this be addressed in any way? Unless I understand default duration wrong the file is broken, however it plays with everything else.

Sample file
https://s3.amazonaws.com/MatejK/Samples/raw-audio-problem.mkv