ts type judgment incorrectly crosses the boundaries of the asynchronous task

[sun-jingfeng]

Does this issue occur when all extensions are disabled?: No

1.Version information：
Version: 1.96.0 (Universal)
Commit: 138f619c86f1199955d53b4166bef66ef252935c
Date: 2024-12-11T02:29:09.626Z
Electron: 32.2.6
ElectronBuildId: 10629634
Chromium: 128.0.6613.186
Node.js: 20.18.1
V8: 12.8.374.38-electron.0
OS: Darwin arm64 23.4.0

2.The bug recurrence code is as follows：

let globalStr: string | null = 'abc'
const asyncFun = async () => {
  if (globalStr) {
    console.log(globalStr)
    await new Promise(res => setTimeout(res, 3000))
    console.log(globalStr) // Is globalStr of type string wrong?
  }
}
asyncFun()
globalStr = null

[MartinJohns]

Duplicate of #9998.