Preflight Checklist

• I have read the Contributing Guidelines for this project.
• I agree to follow the Code of Conduct that this project adheres to.
• I have searched the issue tracker for a bug report that matches the one I want to file, without success.

Electron Version

36.5.0

What operating system(s) are you using?

macOS

Operating System Version

macOS26 beta

What arch are you using?

arm64 (including Apple Silicon)

Last Known Working Electron version

No response

Does the issue also appear in Chromium / Google Chrome?

I don't know how to test

Expected Behavior

invoking appIcon.toDataURL() should get a normal url.

Actual Behavior

got a error url

Testcase Gist URL

https://gist.github.com/wanghanzhen/bac0d6782ce8c995293d86375263545b

Additional Information

No response