Currently when using the --experimental-resolve-self flag, with the following:

{
  "name": "test",
  "exports": "./test.js"
}

If including a require('test') in the test.js file and running node --experimental-resolve-self pkg/test.js this will throw an error.

It works with "main" and exports subpaths though so may be a sugar-specific or main-specific error case for this flag.