Dezoomify is a web application to download zoomable images from museum websites, image galleries, and map viewers. Many different zoomable image technologies are supported.
I'm seeing the same problem. When you go to any of the "Additional Items" at the bottom of this page, Dezoomify will run but it always downloads the first image.
certain artworks on google arts & culture have child assets/additional items linked to the main artwork. example: https://artsandculture.google.com/asset/back/SgEQsRSgCxo5Vg?childAssetId=oAEksnLb3AzgOw
these don't download properly, not with the browser extension nor with dezoomify-rs. when trying to download child assets, i get the main artwork.