Link to the code that reproduces this issue

https://codesandbox.io/p/devbox/jovial-tree-fwk39m?file=/app/page.tsx:4,62&layout=%7B%22sidebarPanel%22%3A%22EXPLORER%22%2C%22rootPanelGroup%22%3A%7B%22direction%22%3A%22horizontal%22%2C%22contentType%22%3A%22UNKNOWN%22%2C%22type%22%3A%22PANEL_GROUP%22%2C%22id%22%3A%22ROOT_LAYOUT%22%2C%22panels%22%3A%5B%7B%22type%22%3A%22PANEL_GROUP%22%2C%22contentType%22%3A%22UNKNOWN%22%2C%22direction%22%3A%22vertical%22%2C%22id%22%3A%22clyg9bptg00063j6kfzrtt3fc%22%2C%22sizes%22%3A%5B70%2C30%5D%2C%22panels%22%3A%5B%7B%22type%22%3A%22PANEL_GROUP%22%2C%22contentType%22%3A%22EDITOR%22%2C%22direction%22%3A%22horizontal%22%2C%22id%22%3A%22EDITOR%22%2C%22panels%22%3A%5B%7B%22type%22%3A%22PANEL%22%2C%22contentType%22%3A%22EDITOR%22%2C%22id%22%3A%22clyg9bptg00023j6k3w4rphuo%22%7D%5D%7D%2C%7B%22type%22%3A%22PANEL_GROUP%22%2C%22contentType%22%3A%22SHELLS%22%2C%22direction%22%3A%22horizontal%22%2C%22id%22%3A%22SHELLS%22%2C%22panels%22%3A%5B%7B%22type%22%3A%22PANEL%22%2C%22contentType%22%3A%22SHELLS%22%2C%22id%22%3A%22clyg9bptg00043j6kmh0go18l%22%7D%5D%2C%22sizes%22%3A%5B100%5D%7D%5D%7D%2C%7B%22type%22%3A%22PANEL_GROUP%22%2C%22contentType%22%3A%22DEVTOOLS%22%2C%22direction%22%3A%22vertical%22%2C%22id%22%3A%22DEVTOOLS%22%2C%22panels%22%3A%5B%7B%22type%22%3A%22PANEL%22%2C%22contentType%22%3A%22DEVTOOLS%22%2C%22id%22%3A%22clyg9bptg00053j6kuo9qzs1s%22%7D%5D%2C%22sizes%22%3A%5B100%5D%7D%5D%2C%22sizes%22%3A%5B50%2C50%5D%7D%2C%22tabbedPanels%22%3A%7B%22clyg9bptg00023j6k3w4rphuo%22%3A%7B%22tabs%22%3A%5B%7B%22id%22%3A%22clyg9bptg00013j6kpjw6zalf%22%2C%22mode%22%3A%22permanent%22%2C%22type%22%3A%22FILE%22%2C%22filepath%22%3A%22%2FREADME.md%22%2C%22state%22%3A%22IDLE%22%7D%2C%7B%22id%22%3A%22clyga1kel00023j6jbbv43sut%22%2C%22mode%22%3A%22permanent%22%2C%22type%22%3A%22FILE%22%2C%22initialSelections%22%3A%5B%7B%22startLineNumber%22%3A4%2C%22startColumn%22%3A62%2C%22endLineNumber%22%3A4%2C%22endColumn%22%3A62%7D%5D%2C%22filepath%22%3A%22%2Fapp%2Fpage.tsx%22%2C%22state%22%3A%22IDLE%22%7D%5D%2C%22id%22%3A%22clyg9bptg00023j6k3w4rphuo%22%2C%22activeTabId%22%3A%22clyga1kel00023j6jbbv43sut%22%7D%2C%22clyg9bptg00053j6kuo9qzs1s%22%3A%7B%22id%22%3A%22clyg9bptg00053j6kuo9qzs1s%22%2C%22tabs%22%3A%5B%7B%22type%22%3A%22UNASSIGNED_PORT%22%2C%22port%22%3A3000%2C%22id%22%3A%22clyg9yq6t00es3j6k6oy35ccs%22%2C%22mode%22%3A%22permanent%22%2C%22path%22%3A%22%2F%22%7D%5D%2C%22activeTabId%22%3A%22clyg9yq6t00es3j6k6oy35ccs%22%7D%2C%22clyg9bptg00043j6kmh0go18l%22%3A%7B%22id%22%3A%22clyg9bptg00043j6kmh0go18l%22%2C%22tabs%22%3A%5B%7B%22id%22%3A%22clyg9bptg00033j6k5zx5lc4f%22%2C%22mode%22%3A%22permanent%22%2C%22type%22%3A%22TASK_LOG%22%2C%22taskId%22%3A%22dev%22%7D%5D%2C%22activeTabId%22%3A%22clyg9bptg00033j6k5zx5lc4f%22%7D%7D%2C%22showDevtools%22%3Atrue%2C%22showShells%22%3Atrue%2C%22showSidebar%22%3Atrue%2C%22sidebarPanelSize%22%3A15%7D

To Reproduce

1. npm run build && npm run start
2. Visit root page /
3. The ImageResponse will have a bogus Cache-Control header public, immutable, no-transform, max-age=31536000, max-age=3600, s-maxage=3600

Current vs. Expected behavior

Currently, ImageResponse merges the headers options while keeping all default headers instead of respecting the explicit overwrite from the developer. E.g., "{ headers: { 'Cache-Control': 'max-age=3600, s-maxage=3600' } }becomesCache-Control: public, immutable, no-transform, max-age=31536000, max-age=3600, s-maxage=3600`.

As an expected behavior, "{ headers: { 'Cache-Control': 'max-age=3600, s-maxage=3600' } }should becomeCache-Control: max-age=3600, s-maxage=3600`.

Provide environment information

Operating System:
  Platform: linux
  Arch: x64
  Version: #1 SMP PREEMPT_DYNAMIC Sun Aug  6 20:05:33 UTC 2023
  Available memory (MB): 4102
  Available CPU cores: 2
Binaries:
  Node: 20.9.0
  npm: 9.8.1
  Yarn: 1.22.19
  pnpm: 8.10.2
Relevant Packages:
  next: 15.0.0-canary.62 // Latest available version is detected (15.0.0-canary.62).
  eslint-config-next: N/A
  react: 19.0.0-rc-6f23540c7d-20240528
  react-dom: 19.0.0-rc-6f23540c7d-20240528
  typescript: 5.3.3
Next.js Config:
  output: N/A

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

Not sure

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

next dev (local), next start (local), Vercel (Deployed)

Additional context

No response