Hey there,

I am really sorry for the delay of this reply as it is a weekend for us here.

Regarding those AMP page only available for the blog entry page instead of blog listing page.

So you have to check it for the single blog URL in Google AMP test tool.

For example :

[gist type="php"]
https://search.google.com/test/amp?id=xBgNoesAZV_4hWv2ykfD_Q
[/gist]

Do note, you have to append /amp behind of the blog URL before search.