I'm not sure I follow. The popup shows you the tab you're hovering over. You wouldn't be hovering over the last tab because it's not in the visible area.

But that's unrelated to the problem they fixed. Right now, when you open a large amount of tabs, it always shows favicons. What it used to do, when tabs got smaller than about 30 pixels, was this: https://www.technorms.com/wp-content/uploads/2010/06/TooMany...