An app that is also sherlocked by macOS 26 is "FolderMarker" by Elena Drozhzhina / imagestudiopro.com. For years now I was using this very nice and versatile app to color folders and emboss icons on them. FolderMarker works by creating a hidden "Icon?" in the folder; the same happens when pasting an image in the Finder's file info dialog, a feature that reaches very far back in macOS history. However looking at macOS 26 beta, the new folder colors/emoj seem to use a different mechanism. I hope the old "Icon?" override will remain functional, so the many FolderMarker custom colors I already have will keep showing.