I'm not sure if this actually had anything to do with this issue but based on the current update, whenever the amount of text exceeds the popout window, the text below the bottom isn't accessible:

and when I try to select it to scroll down, it ends up turning out like this:


(I copied and pasted the same lines multiple times for the sake of demonstration)
This happens with all versions of the editor (global, single-page popout, and regular sidebar).