WinUI3 C++/winrt packaged SmartCardReader application exit timeout

[mareksm]

My test app is using winrt::Windows::Devices::Enumeration::DeviceWatcher and creating winrt::Windows::Devices::SmartCards::SmartCardReader instance by calling:

co_await winrt::Windows::Devices::Enumeration::DeviceInformation::FindAllAsync(SmartCardReader::GetDeviceSelector())
and then creating a reader instance with co_await SmartCardReader::FromIdAsync(device.Id()) from the collection above.

App is running fine with one problem - when main window is closed, I'd expect the app process (in TaskManager) would exit too. But it lingers for quite some time with the following stack trace:

ntdll.dll!NtWaitForSingleObject�() KERNELBASE.dll!WaitForSingleObjectEx�() Windows.Devices.SmartCards.dll!Windows::Devices::SmartCards::SmartCardReaderEventManager::WaitForEvent(void *,unsigned long) Windows.Devices.SmartCards.dll!Windows::Devices::SmartCards::SmartCardReaderEventManager::InternalDeinitialize(void) Windows.Devices.SmartCards.dll!ComErrorContract<<lambda_da5d591f47daddf166a5d7c13fa896d9>>() Windows.Devices.SmartCards.dll!Windows::Devices::SmartCards::SmartCardReaderEventManager::~SmartCardReaderEventManager(void) ucrtbase.dll!<lambda>(void)() ucrtbase.dll!__crt_seh_guarded_call<int>::operator()<<lambda_7777bce6b2f8c936911f934f8298dc43>,<lambda>(void) &,<lambda_3883c3dff614d5e0c5f61bb1ac94921c>>() ucrtbase.dll!_execute_onexit_table�() ucrtbase.dll!__crt_state_management::wrapped_invoke<int (*)(int *),int *,int>(int (*)(int *),int *) Windows.Devices.SmartCards.dll!dllmain_crt_process_detach() Windows.Devices.SmartCards.dll!dllmain_dispatch() ntdll.dll!LdrpCallInitRoutine() ntdll.dll!LdrShutdownProcess�()

If I disable the call to winrt::Windows::Devices::Enumeration::DeviceInformation::FindAllAsync() - the process exits immediately. Is there anything needed to shutdown reader instance properly on exit? The only option I've found is DeviceWatcher::Stop() method, but that doesn't help.