Tmds.DBus.Protocol.DisconnectedException: Object reference not set to an instance of an object. on 11.1

[MVKozlov]

Describe the bug

I try build test Classic desktop app with Tray icon

This work ok

a bit later I want to use Tmds.DBus.Protocol package for my own dbus experiments and get core dump

Unhandled exception. Tmds.DBus.Protocol.DisconnectedException: Object reference not set to an instance of an object.

---> System.NullReferenceException: Object reference not set to an instance of an object. at Tmds.DBus.Protocol.MessageWriter.WriteRaw(String data) at Tmds.DBus.Protocol.MessageWriter.WriteStringCore(String s) at Tmds.DBus.SourceGenerator.VariantWriter.WriteDBusItem(MessageWriter& writer, DBusItem value) at Tmds.DBus.SourceGenerator.VariantWriter.WriteDBusVariant(MessageWriter& writer, DBusVariantItem value) at Tmds.DBus.SourceGenerator.WriterExtensions.WriteDictionary_aesv(MessageWriter& writer, Dictionary`2 values) at Tmds.DBus.SourceGenerator.OrgKdeStatusNotifierItem.<>c__DisplayClass22_0.g__Reply|13() at Tmds.DBus.SourceGenerator.OrgKdeStatusNotifierItem.HandleMethodAsync(MethodContext context) at Tmds.DBus.Protocol.DBusConnection.HandleMessages(Exception exception, Message message) --- End of inner exception stack trace --- at Tmds.DBus.Protocol.DBusConnection.MyValueTaskSource`1.System.Threading.Tasks.Sources.IValueTaskSource.GetResult(Int16 token) at Tmds.DBus.Protocol.DBusConnection.CallMethodAsync(MessageBuffer message) at Tmds.DBus.Protocol.Connection.CallMethodAsync(MessageBuffer message) at Avalonia.FreeDesktop.DBusTrayIconImpl.CreateTrayIcon() at System.Threading.Tasks.Task.<>c.b__128_0(Object state) at Avalonia.Threading.SendOrPostCallbackDispatcherOperation.InvokeCore() at Avalonia.Threading.DispatcherOperation.Execute() at Avalonia.Threading.Dispatcher.ExecuteJob(DispatcherOperation job) at Avalonia.Threading.Dispatcher.ExecuteJobsCore(Boolean fromExplicitBackgroundProcessingCallback) at Avalonia.Threading.Dispatcher.Signaled() at Avalonia.X11.X11PlatformThreading.CheckSignaled() at Avalonia.X11.X11PlatformThreading.RunLoop(CancellationToken cancellationToken) at Avalonia.Threading.DispatcherFrame.Run(IControlledDispatcherImpl impl) at Avalonia.Threading.Dispatcher.PushFrame(DispatcherFrame frame) at Avalonia.Threading.Dispatcher.MainLoop(CancellationToken cancellationToken) at Avalonia.Controls.ApplicationLifetimes.ClassicDesktopStyleApplicationLifetime.Start(String[] args) at Avalonia.ClassicDesktopStyleApplicationLifetimeExtensions.StartWithClassicDesktopLifetime(AppBuilder builder, String[] args, Action`1 lifetimeBuilder) at Test.Desktop.Program.Main(String[] args) in D:\Work\cs\Test\Test.Desktop\Program.cs:line 13 Aborted (core dumped)

To Reproduce

Take default trayicon example
https://docs.avaloniaui.net/docs/reference/controls/tray-icon
add latest stable Tmds.DBus.Protocol (0.19)

dotnet publish -c Release -r linux-x64 -o publish\linux --no-self-contained /p:PublishSingleFile=true

other publish types also tied, no success

Expected behavior

no core dump

Avalonia version

11.0.10-11.1.2

OS

Linux

Additional context

Ubuntu 22.04
Net 6.0
Tmds.DBus.Protocol 0.19
seems 0.17 and below are usable for 11.0.10
but on 11.1.2 it make core dump

[MVKozlov]

Fixed in #15568