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Just wanted to add my name to this and say that I've been having this quite a bit since I got my 4k TV earlier this year. I don't ever remember it happening when my Xbox One X was connected to my older 1080p set. My current TV is a Sony KD49XF80.
I see it in YouTube constantly. MSNBC videos, for example, pretty much always reliably glitch on me. If you rewind the video and replay the same section it will normally be fine on a second attempt.
I feel it's possible I've seen the same glitch on Netflix, just much, much, more rarely, but I can't be certain.
If it's on two apps you might suspect system-level issues (some video-decoding chip or code acting up), if it's just one app it's probably the app itself. I wish I could be sure. If I see Netflix glitch again I'll reply here.