### Tested versions

Godot Engine v4.2.stable.official.46dc27791

### System information

Windows 10

### Issue description

When exporting to web, Godot fails with this error in the console:

> scene/main/window.cpp:884 - Attempting to make child window exclusive, but the parent window already has another exclusive child. This window: /root/@<!-- -->EditorNode@<!-- -->17120/@<!-- -->Panel@<!-- -->13/@<!-- -->ProjectExportDialog@<!-- -->559/@<!-- -->VBoxContainer@<!-- -->137/@<!-- -->AcceptDialog@<!-- -->411, parent window: /root/@<!-- -->EditorNode@<!-- -->17120/@<!-- -->Panel@<!-- -->13/@<!-- -->ProjectExportDialog@<!-- -->559, current exclusive child window: /root/@<!-- -->EditorNode@<!-- -->17120/@<!-- -->Panel@<!-- -->13/@<!-- -->ProjectExportDialog@<!-- -->559/@<!-- -->ProgressDialog@<!-- -->17444

![a](https://github.com/godotengine/godot/assets/2000051/bf9d22aa-d3fe-4e11-bff6-c387e740fe90)

This happens for newly created empty projects.


### Steps to reproduce

1. Open the attached project (or create a new project).
2. Project->Export->Export All
3. Observe the console error.  No output files are generated.


### Minimal reproduction project (MRP)

[export_test.zip](https://github.com/godotengine/godot/files/13574810/export_test.zip)

}
	} else {
		Ref<Image> splash;
		const String splash_path = GLOBAL_GET("application/boot_splash/image");
		if (!splash_path.is_empty()) {
			splash.instantiate();
			const Error err = ImageLoader::load_image(splash_path, splash);
			if (err) {
				splash.unref();
			}
		}
		if (splash.is_null()) {
			splash = Ref<Image>(memnew(Image(boot_splash_png)));
		}
		
		
		
		
		const String splash_png_path_2x = p_dest_dir.path_join("splash@2x.png");
		const String splash_png_path_3x = p_dest_dir.path_join("splash@3x.png");
		if (splash->save_png(splash_png_path_2x) != OK) {
			return ERR_FILE_CANT_WRITE;
		}
		if (splash->save_png(splash_png_path_3x) != OK) {
			return ERR_FILE_CANT_WRITE;
		}
	}
	return OK;
}
Error EditorExportPlatformIOS::_export_loading_screen_images(const Ref<EditorExportPreset> &p_preset, const String &p_dest_dir) {