I recorded the sample from Tvheadend stream on PC-VLC player (attached here https://drive.google.com/open?…etb97bjmkyyvvnw6vf26l-mni). I tried to stream this HD channel directly to my H series TV Samsung (non-HEVC prcessor) and to my surprise it is capable to play it without problems. I guess it can be something with video stream processing in KODI....?
More likely explanation is that re-encoding happened in between, which would change codec features used in video file. I'm not sure how to correctly get unchanged DVB video as I don't have DVB experiences, but you can try with ffmpeg. Nice thing in ffmpeg is that you can specify that it only copies video stream with "-c:v copy -c:a copy".