Component and Data Disappear after refresh page

I am working on an expo app. I got a situation which my component/data disappear after page refresh, but when I make any kind of changes in my code(such as just adding semicolon) and click save, component/data shows up, then once again, while I click refresh, component/data disappear.

The situation is very similar to the page React component content disappears after page refresh, which state return [] after refresh. I have tried all the methods in the page, but none of them work in my case.

  const [Final, setFinal] = useState([]);
  const [Sign, setSign] = useState([[);
  const [Linedata, SetLinedata] = useState([]);      
  useEffect(() => {
    (async () => {
      getSign();
      getLine();
      setFinal(await getFinal());
    })();
  }, [])
  const getFinal =  () => {
    // combine sing data and line data 
return new Promise((resolve)=>{
  const FinalLineData = Sign.map((item, i) => Object.assign({}, item, { Line: Linedata[item['sign']] }))
resolve(FinalLineData)
})