watchFile never fires when vfs uses a real dir

Version

main

Platform

macOS 26.2

Subsystem

vfs

What steps will reproduce the bug?

test.js:

const vfs = require('node:vfs');
const fs = require('fs');

const v = vfs.create(new vfs.RealFSProvider('/tmp'));

let called = false;
v.watchFile('/a.txt', { interval: 50 }, () => {
  called = true;
});

fs.writeFileSync('/tmp/a.txt', 'x');

setTimeout(() => {
  console.log('called?', called);
}, 300);

$ node --experimental-vfs test.js

How often does it reproduce? Is there a required condition?

Always

What is the expected behavior? Why is that the expected behavior?

called? true

file changed, the listener should run

What do you see instead?

called? false

Additional information

No response

Bắt đầu với test.js và các entry point node:vfs cho RealFSProvider và watchFile, sau đó tái hiện vấn đề bằng node --experimental-vfs test.js. Theo dõi lý do listener không được gọi sau khi /tmp/a.txt thay đổi; hoàn tất khi ví dụ báo called? true.