flow.bound doesn't work，generator func doesn't bind this correctly

[QJerryxjh]

Intended outcome: use flow.bound ,generator func bind this correctly

Actual outcome: this is undefined

How to reproduce the issue: codesandbox url

Versions
mobx
6.3.12
mobx-react-lite
3.2.3
react
17.0.2
react-dom
17.0.2
react-scripts
4.0.0

[urugator]

Weird, how is this passing? :D

mobx/packages/mobx/__tests__/v5/base/make-observable.ts

Line 695 in a563e37

expect(await foo["flow.bound"].call(null)).toBe(foo)

EDIT: managed to replicate, working on it.