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

36.0.1

What operating system(s) are you using?

Windows

Operating System Version

11

What arch are you using?

x64

Last Known Working Electron version

36.0.0-beta.9

Expected Behavior

Frameless windows should not show own titlebar

Actual Behavior

Frameless windows show own titlebar on blur window event

Testcase Gist URL

https://gist.github.com/bukharin/4e5fa26e3ab87c7ca03d002ba9b5ca60

Additional Information

I guess this is a regress after #46657