slint 1.12: with_winit_window return None

[CarbonPool]

Bug Description

let ui = AppWindow::new()?;
ui.window().with_winit_window(|window: &Window| {
        
}).unwrap();

Error: called Option::unwrap() on a None value. It seems that this prompt was not available in the previous version.

Reproducible Code (if applicable)

Environment Details

• Slint Version:
• Platform/OS:
• Programming Language:
• Backend/Renderer:

Product Impact

No response