I have 3 different Roku devices - 2 have the Roku app with version: 9.4.0 build 4210 with last update of 05/09/2021 and one has the same version but its last update was 03/09/2021
The app on my older Roku Express works perfectly fine. The most recent apps run normally except now when viewing a YouTube video, I can no longer view the video information (title of video, YouTube channel name, when video was posted, number of views) while the video is running. The info used to be viewable, but no longer is. That info still works fine on my older Roku Express, just not on the Roku devices with the most recent version of the app.
It's obviously an issue with the most recent version of the app.
I hope you can try to correct this problem with your next update.
You dont mention your Roku model #s, just the names (there are lots of different models with the same names).
Also, just as an FYI, those are the RokuOS firmware versions - not the YT app versions.
YT/YTTV (and other) apps (platform/external) versions can be seen by highlighting the app, and pressing the Options (*) button.
YT/YTTV have different external/platform versions/builds for different models as well.
YT/YTTV also have an internal/UI version separate from the platform/external versions.
Because of the different platform versions in combination with UI versions, the overall functionality/behavior of the app may be different for different Roku models.
You might want to check the actual app versions (external and internal) and compare them between your devices.
If you havent already removed the YT app, RESTARTED your Roku, then reinstalled the YT app (in that exact) order, you should.
Ultimately, Google is responsible for the YT/YTTV apps as previously explained, so you'd want to give that specific information to them