throttling can cause the count not to update. From testing with react dev tools this seems to not cause much issue as it is only updating state if the card count changes

Author: oliverabrahams

dotcom-rendering/src/components/ScrollableCarousel.tsx

@@ -464,14 +464,11 @@ export const ScrollableCarousel = ({
 		if (!carouselElement) return;
 		if (!isArticle) return;
 
-		carouselElement.addEventListener(
-			'scroll',
-			throttleEvent(updateCardCountOnScroll),
-		);
+		carouselElement.addEventListener('scroll', updateCardCountOnScroll);
 		return () => {
 			carouselElement.removeEventListener(
 				'scroll',
-				throttleEvent(updateCardCountOnScroll),
+				updateCardCountOnScroll,
 			);
 		};
 	}, [isArticle, updateCardCountOnScroll]);