Access through dynamic import doesn't contribute to "reference"

[Jack-Works]

TypeScript Version: 4.2.0.dev.20201108

Search Terms: dynamic import file module

Code

test.ts

export function hey() {}

const t = import('./test')
t.then((x) => x.hey)

If you rename hey, test2.ts won't be renamed. And hey reports 0 references on it.

But strangely if I change it to

const t = import('./test')

t.then((x) => x.a)
import * as q from './test'

It works now.