next.js 16 lacks build size info

[gengjiawen]

Link to the code that reproduces this issue

https://github.com/gengjiawen/repro-nextjs

To Reproduce

create a new next 16 project and build

Current vs. Expected behavior

current: no build info

Route (app)
┌ ƒ /
├ ○ /_not-found
├ ƒ /api/hetzner-traffic

on nextjs 15:

Route (app) Size First Load JS
┌ ƒ / 3.46 kB 105 kB
├ ○ /_not-found 991 B 102 kB
├ ƒ /api/hetzner-traffic 133 B 101 kB

Provide environment information

Operating System:
  Platform: linux
  Arch: x64
  Version: #71-Ubuntu SMP PREEMPT_DYNAMIC Tue Jul 22 16:52:38 UTC 2025
  Available memory (MB): 7752
  Available CPU cores: 4
Binaries:
  Node: 22.21.1
  npm: 10.9.4
  Yarn: 1.22.22
  pnpm: 9.15.9
Relevant Packages:
  next: 16.0.1 // Latest available version is detected (16.0.1).
  eslint-config-next: N/A
  react: 19.2.0
  react-dom: 19.2.0
  typescript: N/A
Next.js Config:
  output: N/A

Which area(s) are affected? (Select all that apply)

Turbopack

Which stage(s) are affected? (Select all that apply)

next build (local)

Additional context

No response

[mischnic]

This was an intentional change, see the description of #83815 for the detailed reasoning.