[import/export] False "Multiple exports of name" error when two "export * as ..." contain same name.

[zimmed]

Apologies if this is a duplicate -- it's difficult to search terms with an asterisk.

Found issue using:
eslint 6.6.0, 6.8.0, 7.3.1
eslint-plugin-import 2.20.2, 2.21.2
(tried various versions to see if it had already been fixed)

Setup:

// A.js
export const FOO = 'a-foobar';

// B.js
export const FOO = 'b-foobar';

// C.js
export * as A from './A';
export * as B from './B';

Expected:

No import/export error in C.js, since both instances of FOO are under their own namespaces (A/B).

import * as C from './C';

console.log(C.A.FOO); // 'a-foobar'
console.log(C.B.FOO); // 'b-foobar'
console.log(C.FOO); // undefined

Result:

Error in C.js:
Multiple exports of name 'FOO'. eslint(import/export)

Workaround

The following equivalent method works without errors, but annoying because ESLint is preventing me from taking advantage of newer ES syntax:

import * as A from './A';
import * as B from './B';

export { A, B };

[ljharb]

This might be a duplicate of #518?

[zimmed]

This might be a duplicate of #518?

That seems to be related to shadowing, whereas this example has no actual variable shadowing. If it was...

export * from './A';
export * from './B';

Then that would likely be the issue, but since the original code posted is equivalent to:

import * as A from './A';
import * as B from './B';

export { A, B };

There are no shadowed variable names, since FOO only exists within the individual namespaces. (This works without lint errors, by the way).