### 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)

}
	if (err == OK && !so_files.is_empty()) {
		
		Ref<DirAccess> da = DirAccess::create(DirAccess::ACCESS_FILESYSTEM);
		for (int i = 0; i < so_files.size() && err == OK; i++) {
			String src_path = ProjectSettings::get_singleton()->globalize_path(so_files[i].path);
			String target_path;
			if (so_files[i].target.is_empty()) {
				target_path = p_path.get_base_dir();
			} else {
				target_path = p_path.get_base_dir().path_join(so_files[i].target);
				da->make_dir_recursive(target_path);
			}
			target_path = target_path.path_join(src_path.get_file());
			if (da->dir_exists(src_path)) {
				err = da->make_dir_recursive(target_path);
				if (err == OK) {
					err = da->copy_dir(src_path, target_path, -1, true);
				}
			} else {
				err = da->copy(src_path, target_path);
				if (err == OK) {
					err = sign_shared_object(p_preset, p_debug, target_path);
				}
			}
		}
	}
	return err;
}
Error EditorExportPlatformPC::sign_shared_object(const Ref<EditorExportPreset> &p_preset, bool p_debug, const String &p_path) {