When a palette is downloaded in the ase (Adobe Swatch Exchange) file format, the color blocks are not enclosed within a group block (and its closing block). As a result, the last color swatch will be missing when the palette is imported into GIMP. I realize that, with file formats, it's debatable as to whether the importer or the exporter is the culprit and should change. An absent group is not an issue when importing into Krita or Photopea, for example. But I thought it wouldn't hurt if Lospec ase 's were more broadly usable. A diagram demonstrating a group structure can be found at: https://medium.com/swlh/mastering-adobe-color-file-formats-d29e43fde8eb .