Caught one! Right below madsircool’s post here
Which is 19/24, it stuck in my usual samsung internet. I switched over to chrome and clicked my way down to the same thread, and the same stuck point occurred, below madsircool’s same post. (chrome= “Thomas English Muffins” short ad; samsung= no ad just a blank spot. Both have “ADVERTISEMENT” text.) If I scroll back to the top, then down again, it continues, no stuck. (samsung= “RENT” short ad; chrome bigger “Dumbest States in America” ad.)
There was another one caught but I wasn’t awake enough to remember the details or to compare and contrast.
If I understand it right, the ads are supposed to give a size so Discourse can lay it out properly? So “no size given” means nul more scrolling (I hope you understand what I mean). What happens if “no size given” then plug in a default size. If only the top edge of the ad is displayed (a bigger ad cropped to a short ad size), at least it won’t gum up the works. If they complain tell them they got to put in a size.