This is a new issue that needs to be resolved by Comcast / Xfinity. I've used their Netflix for years and it's only recently (within the first half of 2020) been doing stretching 4:3 content to 16:9 regardless of the TVs settings or the settings for the set top box. If I open Netflix on either of my Smart TVs built in apps, it is in the right aspect ratio, however on my older TV, the Netflix app hasn't had an update, so it lags. The Xfinity version doesn't lag, but it's stretched. It's annoying.
... View more