Garbage/Uninitialized content is displayed at startup before read display

Hi,

When I run `cargo run -p wgpu_texture --release`, I found that there is a bug at the startup time of the example project

https://github.com/user-attachments/assets/29d51a88-77b7-4247-8c15-1a3103b270a0

from video time 00:00 to 00:03 (or stopwarth time 05:49.976 -> 05:50.319), the blitz windows is displayed but its content is displaying some garbage / or uninitialized content (the content is actually from my second monitor), and that display will continue for about **400ms**. (from the stopwatch page's counter)

I think this is a bug, the expected behavior should be, the window is displayed, at the duration when wgpu is not ready, it should display white/black or theme color when set / or splash picture if implemented.

The bug is recorded on Ubuntu 24.04.

When I do the same test on Windows, the Window content is white during wpgu initialization.