For example, here is the output of the end of a story in PM:

Here is the end of the same story in another browser (Edge, in this case), after it has done the second load:

The display goes down to 10 stories, and then shows a useful site directory after that.
PM exhibited the proper behavior until sometime in the last few weeks or so; then it broke. Apparently The Atlantic changed something on their website.
Meanwhile, The Atlantic does not display many pictures (possibly most pictures) properly when using PM. For example, here's a picture from the story What Do Dogs Know About Us? displayed in PM:

And here's the same image displayed in Edge:

In the PM image, although the image itself is blank, all the standard right-click context menus are present and do the right thing. For example, if you click on "View Image" in the right click context menu, PM loads a page consisting of the proper image on a dark background.
Please note that The Atlantic is a subscription website that allows a few free articles per month. As a result, nonsubscribers have to be careful with the number of articles they load.