Two of our storybook thumbnails appear to not be rendering correctly:
https://doc.wikimedia.org/Popups/master/js/ui/?path=/story/thumbnails--landscape-svg
https://doc.wikimedia.org/Popups/master/js/ui/?path=/story/thumbnails--landscape-thin-thumbnail
Looking a little closer the URL for the image is being modified. For example in .storybook/mocks/models.js the URL for the thumbnail is expressed as img/258px-Barker_poster.jpg but for some reason this gets modified to substitute the URL with the height to img/Barker_poster.jpg/640px-Barker_poster.jpg
We should investigate what's going on here and if there's a larger problem caused by this outside storybook land.