[deno-loader] Wrong path when using private NPM registry for islands

[joeftiger]

I am using GitHub's private NPM registry with the following .npmrc scheme:

//npm.pkg.github.com/:_authToken=...
@my_org:registry=https://npm.pkg.github.com

While running deno checks and deno task start work without problems, they start occuring once I try to open the webpage.
Islands relying on imports from the private registry end up with errors like following:

islands/MyIsland.tsx:5:24: ERROR: [plugin: deno-loader] The system cannot find the path specified. (os error 3): stat '...\AppData\Local\deno\npm\registry.npmjs.org\@my_org\my_module\0.0.3'

I don't know why, but it is using registry.npmjs.org inside the path instead of npm.pkg.github.com. The former obviously doesn't contain the private modules/packages.

As I am using Windows, I tried using a shortcut link from registry.npmjs.org\@my_org to npm.pkg.github.com\@my_org, but without success as it doesn't follow the symlink.