Bug: After kills the app, the cleanup function in useEffect does not execute？ about react

[Jyotiprakash-Redapple]

import React from 'react'
export default function App(){

  React.useEffect(()=>{

    // execute when component insert into dom 
    return ()=>{
      // componet when destory to dom
    }
  },[
  //  componentdidUpdate
  ])
  return <>App</>
}

• on this way you write it is execute all of life cycle

[jianxiansining]

import React from 'react'
export default function App(){

  React.useEffect(()=>{

    // execute when component insert into dom 
    return ()=>{
      // componet when destory to dom
    }
  },[
  //  componentdidUpdate
  ])
  return <>App</>
}

• on this way you write it is execute all of life cycle

useEffect(()=>{
console.log('join。。。。。。');
return()=>{
console.log('exit。。。。。。');
}
})
When killing an app, 'exit...' This log still cannot be printed

Currently: If the first page after opening the app is A, click on a method on page A to jump to page B.
Scenario 1: Click to return to page A, where the cleaning function will be executed.
Scenario 2: Force the app to be killed, and the cleaning function on page B will not be executed.
I tested that it is feasible in the lower version of React, but not in the latest version.