Bizarre h4 error only on one tv?

Ok so a similar thing happened before, but

I’m trying to watch TNG in 1080p. On my Chromecast Ultra, connected to my Vizio OLED, if I play original quality, I get an error saying that the transcoder did not start. If I switch the quality to convert automatically, I get an H4 error.

However, if I go to my standard Chromecast that’s attached to an ancient oCosmo LCD TV in my bedroom, if I play original quality I get the same transcoder error, but when I switch to convert automatically it plays just fine.

Here’s a really weird part: if I take the standard Chromecast from my oCosmo TV and attach it to my Vizio OLED, (instead of the Chromecast Ultra which is normally connected to the Vizio), I get both errors again. I only get both errors when any type of Chromecast is connected to my OLED tv, but not the other way around.

Have you tried a different HDMI port on your Vizio? I found recently my CCw/GTV acted up when connected to the ARC HDMI port so connected it to another and all was fine