[bug]code splitting: module duplicated when dynamic import with and without chunkName comment

[stormslowly]

problem

// index.tsx
import Lazy1 from './proxy.tsx'
import Lazy2 from './proxy2.tsx'

console.log(Lazy1, Lazy2)

// proxy.tsx
import React from 'react';
export default React.lazy(async () => {
  return import(/*  makoChunkName: 'named' */ './lazy.tsx');
});

// proxy2.tsx
import React from 'react';
export default React.lazy(async () => {
  return import('./lazy.tsx');
});

the project will generate

$ ls  dist/*.js
dist/index.js
dist/lazy_tsx-async.js
dist/named-async.js

contents of dist/lazy_tsx-async.js and dist/named-async.js are almost the same; lazy.tsx module is duplcated

expect

lazy.tsx should not be duplicated.