Most of my video play fine with direct play or direct stream but certain video will just artifact, but when the file is transcoding it will play fine without any issues, also running the latest plex server and latest Xbox one Plex app.
@“Dr Tone” said:
https://forums.plex.tv/discussion/173008/known-issues-in-1-8-0#latest
Well I’ve tried using the media player app so it might be an issue with Xbox one.