### 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)

img_bs->resize(info.width * aspect_ratio, info.width, (Image::Interpolation)(p_preset->get("application/launch_screens_interpolation").operator int()));
						} else {
							img_bs->resize(info.height, info.height / aspect_ratio, (Image::Interpolation)(p_preset->get("application/launch_screens_interpolation").operator int()));
						}
					}
				} else {
					if (boot_logo_scale) {
						if (info.height * aspect_ratio <= info.width) {
							img_bs->resize(info.height * aspect_ratio, info.height, (Image::Interpolation)(p_preset->get("application/launch_screens_interpolation").operator int()));
						} else {
							img_bs->resize(info.width, info.width / aspect_ratio, (Image::Interpolation)(p_preset->get("application/launch_screens_interpolation").operator int()));
						}
					}
				}
				_blend_and_rotate(img, img_bs, info.rotate);
			}
			Error err = img->save_png(p_dest_dir + info.export_name);
			if (err) {
				String err_str = String("Failed to export loading screen (") + info.preset_key + ") from splash screen.";
				WARN_PRINT(err_str.utf8().get_data());
			}
		}
	}
	return OK;
}
Error EditorExportPlatformIOS::_walk_dir_recursive(Ref<DirAccess> &p_da, FileHandler p_handler, void *p_userdata) {
	Vector<String> dirs;
	String current_dir = p_da->get_current_dir();
	p_da->list_dir_begin();
	String path = p_da->get_next();