xnr.upload 'progress' event not emited

[Akiyamka]

Describe the bug

Progress event not emitted

const xhr = new XMLHttpRequest()

// ... uploading logic ... //

xhr.upload.addEventListener('progress', (event) => {
  console.log('Progress') // This callback not called
})

Link to the blitz that caused the error

https://stackblitz.com/edit/vitejs-vite-8t5mbf?file=src%2Fdemo.ts,src%2Fserver.js

Steps to reproduce

1. Open sandbox
2. Press "Click here to start"
3. Press "Upload button"

Expected behavior

I expect that it's work the same way as it works in real live (on my local machine for example) - event emitted, callback called, I can read event data.

Parity with Local

• I have run the project in my local machine and I could not reproduce the issue.

Screenshots

Platform

Browser name  = Firefox 
Full version  = 131.0.2 (64-bit) 
Major version = 131
navigator.appName = Netscape
navigator.userAgent = Mozilla/5.0 (X11; Linux x86_64; rv:131.0) Gecko/20100101 Firefox/131.0 
performance.memory = undefined
Hash = 34c588ed

Also tested on

Browser name  =  Chrome
Full version  = 129.0.6668.100
Major version = 129
navigator.appName = Netscape
navigator.userAgent = Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/129.0.0.0 Safari/537.36

Additional context

No response