Re-posting the info for my particular Roku with the issue. None of my other Roku devices are having this problem.
Roku Model 3941RW - Roku Express 4K+
Serial Number X01600TSFXMP
Software version 11.5.0 build 4235-CR
Device ID S0AH224SFXMP
This happens in the Hulu app on CNN and FX channels.
The issue is very reliable on CNN. When I'm watching the channel and an advertisement starts it freezes the video but the audio continues. If I change to another channel and go back to CNN the video returns. There are no error messages and the tracker ID attempt never works.
Edit: The one app this doesn't happen in is Plex. Go Plex 🙂