If a recording with the kodi addon will be stopped, the tvheadend server stops the recording but kodi doesn't get a feedback and still shows the recording as still in progress. Just a kodi restart solves the problem and the recording doesn't appear again. Starting a recording works perfect. It's just the stop information within kodi. I tried this just with new tvh installations. I heard from users with old configuarions that they don't have this issue.
There, rndmerle found it was a rights issue. There is a new "Failed view" flag in the Video recorder access rights (ae_failed_dvr in the sources), and it's unchecked by default when you carry over 4.0 config file. So the aborted recordings can't be read by the client.
I have added this access right to my 'kodi' user in TVHeadend, but haven't had a chance to test it yet.