I did not get a chance to look last night, i ran the checker and it said 4k, today the checker says the device is not going to get 4k again.
just out of curiosity, are you setting the chromecast to 50hz and hdr to a maximum of hdr 4:2:0 12 bit and match screen dynamic range format? i had issues with amazon prime stuttering and black screens when using it in 60hz mode or with the 50hz mode with dolby vision turned on? Maybe something you have missed that causes the frames being dropped, when i has the setting as i said above the prime video played perfect at 4k hdr
Very interested to find this thread. I watched a lot of rugby last season on ultimate via my Chromecast with Google TV, it worked great. Then this season, the stuttering and frame drops started.
Glad to see Google are on the case and hopefully there's a fix soon. Is there any testing planned for this weekend?