Fetch request infinite pending in a new tab in Chrome - reactjs

Question

In my react project Chrome will never send fetch requests if I open a link in a new tab:
chrome network tab
chrome console tab
Here is standard fetch:
let h = new Headers();
h.append('Accept', 'application/json');
h.append('Content-Type', 'application/json');
h.append('X-Custom-Header', '123');
let req = new Request(url, {
method: 'GET',
headers: h, //заголовки
mode: 'cors'
});
fetch(req).then((response) => {
if(!response.ok) {
console.log(response);
}
return response;
})
.then((response) => response.json())
.then((items) => console.log(items.data))
I tried to do this in dev console:
async function load() {
let response = await fetch('/somesite.com', {
method: 'GET',
headers: {
'Accept': 'application/json',
'Content-Type': 'application/json',
'X-Custom-Header': '123'
},
mode: 'cors'
});
let data = await response.json();
console.log(data);
}
load();
XHR requests doesn't work too. Console log is clean, no mistakes. In Mozilla/Opera/Safari everything is fine.
With disabled chrome://flags/#out-of-blink-cors Chrome will send requests correctly. But it doesn't solve issue for all users.
Access-Control-Allow-Origin set correctly.
I don't understand what is wrong...
Useful links:
https://support.google.com/chrome/thread/11089651?hl=en
https://www.chromestatus.com/feature/5768642492891136
https://www.chromium.org/Home/loading/oor-cors