windows-bindgen: containing root namespace in package generation target causes panic

windows-bindgen = { path = "https://github.com/microsoft/windows-rs" }

use std::{io::Write, path::PathBuf};

use serde::Deserialize;

#[derive(Deserialize)]
#[serde(rename_all = "PascalCase")]
struct VersionInfo {
	release: Release,
	runtime: Runtime,
}

#[derive(Deserialize)]
#[serde(rename_all = "PascalCase")]
struct ReleaseMajorMinor {
	#[serde(rename = "HexUInt32")]
	hex_u32: String,
}

#[derive(Deserialize)]
#[serde(rename_all = "PascalCase")]
struct Release {
	major_minor: ReleaseMajorMinor,
	version_tag: String,
}

#[derive(Deserialize)]
struct RuntimeVersion {
	#[serde(rename = "HexUInt16")]
	hex_u64: String,
}

#[derive(Deserialize)]
#[serde(rename_all = "PascalCase")]
struct Runtime {
	version: RuntimeVersion,
}

fn main() {
	let manifest_dir = PathBuf::from(env!("CARGO_MANIFEST_DIR"));
	let root = manifest_dir.join("../..");

	let winrt = root.join("vendor/nuget/microsoft.windowsappsdk.runtime.2.5.1");

	let version_info_str =
		std::fs::read_to_string(winrt.join("WindowsAppSDK-VersionInfo.json")).unwrap();
	let version_info = serde_json::from_str::<VersionInfo>(
		version_info_str
			.strip_prefix('\\\u{feff}')
			.unwrap_or(&version_info_str),
	)
	.unwrap();

	std::fs::File::create("crates/windows-app-binding/src/version.rs")
		.unwrap()
		.write_all(
			format!(
				r#"pub const WINDOWSAPPSDK_RELEASE_MAJORMINOR: u32 = {};
pub const WINDOWSAPPSDK_RELEASE_VERSION_TAG: windows_core::PCWSTR = windows_core::w!({:?});
pub const WINDOWSAPPSDK_RUNTIME_VERSION_UINT64: u64 = {};
"#,
				version_info.release.major_minor.hex_u32,
				version_info.release.version_tag,
				version_info.runtime.version.hex_u64
			)
			.as_bytes(),
		)
		.unwrap();

	windows_bindgen::bindgen([
		"--etc",
		"crates/windows-app-bindgen/bindings.txt",
		"--package",
		"--out",
		"crates/windows-app-binding",
	]);
}

--in
  default
  vendor/winappsdk/win10-x64/Microsoft.WindowsAppRuntime.2
  vendor/nuget/microsoft.web.webview2.1.0.4255-prerelease/lib
--implement
--filter
  Microsoft.UI.Xaml.Application
  Microsoft.UI.Xaml.Application.Start
  Microsoft.UI.Windowing.AppWindow
  Microsoft.UI.Xaml.ApplicationInitializationCallback

  Microsoft.UI.Xaml.Window

  Microsoft.UI.Composition.SystemBackdrops.MicaController