Yes, I'm having the same video problem when trying to watch some actual "livestreams" on YouTube. The video issue impacts two of my TS4Ks. The live video will play fine for a few seconds then the video becomes distorted with vertical bars and only audio can be heard.
I'm having no issues on video playback of those same YouTube "livestreams" on my IPad or the Roku Ultra I have connected to same TV as one of the TS4K. This seems to strictly be a playback issue on the TS4K. I have tried resetting the YouTube app, uninstalling updates, change YT resolution, but nothing works.
However, as soon as the actual "livestream" ends on YouTube and the video is posted to YT. I can watch the posted video back on the TS4K with no video issue.
This issue seems to have begun a couple months ago for me. I've searched online for YouTube livestream video playback issues but have found nothing on the topic. Seeing your post, makes me realize I'm not the only one having this issue.
While writing this comment I browsed and watched some YT livestreams and found that many livestreams played fine. However as I recall some of the livestreams I have the video playback issue with are those streamers that highlight and display user comments on the screen. I think they are using a program called Stream Yard.
I really hope TiVo can look into the issue or an app update will help fix the issue.
I am attaching a few pictures of a livestream that I found that mimics the distorted video issue I'm talking about.
Pic 1 Selecting the Rekeita Law livestream on YT
Pic 2 The YT livestream is selected and displays full screen and plays without any video/audio issue for 2 seconds
Pic 3 After 2 seconds the livestream video feed becomes distorted as shown and only audio can be heard.
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