Can't import a JavaScript module stored in resources

If a JavaScript module loaded from the file system (/Users/mitch/foo.mjs) tries to import a module stored in the resource system, it fails:

import {boop} from "qrc:/blah/blah.mjs"

Unable to resolve import reference boop

The use case is allowing users to provide their own scripts to the application (e.g. via application arguments) that are run at startup. These scripts should be able to use some built-in (embedded via qrc) convenience scripts provided by the application.

The attached minimal application can be used to reproduce this, though I don't get any errors with it as I do with my actual application; it just silently fails.