[Bug]: Maximizing a window with `backgroundMaterial:` turns it black and removes the rounded corners

[notAperson535]

Preflight Checklist

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

Electron Version

31.3.0

What operating system(s) are you using?

Windows

Operating System Version

Windows 11 23H2 22631.3958

What arch are you using?

x64

Last Known Working Electron version

No response

Expected Behavior

I would like the acrylic effect of the window to still be applied when it is maximized.

Actual Behavior

When maximizing the window with backgroundMaterial: "acrylic" the background turns black. normal window appearance: maximized appearance:

Testcase Gist URL

https://gist.github.com/notAperson535/475b248011fd7a22e6e7be3b5080baa5

Additional Information

To even make this window maximizable these two parameters were added to the browser window:

titleBarStyle: "hidden",
titleBarOverlay: true,

[Kiran-0205]

I have downloaded the gist and tried to run it on macOS

I can't see anything unless i highlighted the text

[notAperson535]

@codebytere thanks for trying to help, but the background effect only works on windows. You wouldn’t be able to tell what the issue is on any other operating system.

[codebytere]

hi @notAperson535 - i think you meant to mention the above commenter and not me? I haven't had a moment to look at this yet.

[notAperson535]

@codebytere yes sorry you appeared at the top of the ping list

[VIXI0]

https://github.com/electron/electron/issues/38466#issuecomment-2576225294

here is a workaround