Netflix, Prime Video, HBO Max, Disney+ and Hulu missing from "Apps" on X1 box...

This morning, I was going to look for something on Prime Video. However, when I clicked on "Apps" via the Xfinity button on the X1's remote, none of the third party apps are found there anymore. I did not receive any notification or correspondence that they were being removed. 

After a lot of searching, I managed to find Netflix, Hulu and Prime Video (but NOT Disney+ or some of the others) as a selection under ON DEMAND and scrolling down about five or six rows to "Streaming Online Services."

What happened?

Is this merely an oversight by Xfinity? I only renewed my contract under the understanding that these would be available in one place via the X1 box (since it doesn't count toward any internet service cap through Xfinity).