Issue using scopes to change a version

Warning Implicitly using latest version (0.182.0) for https://deno.land/std/encoding/_yaml/loader/loader.ts
error: Module not found "https://deno.land/std/encoding/_yaml/loader/loader.ts".

"scopes": {
    "https://deno.land/x/markdown": {
      "https://deno.land/std/": "https://deno.land/std@0.179.0/"
    }
}