System.InvalidOperationException: Visual already has a parent

[fintwx]

有时候点击u:NavMenuItem就直接应用程序退出，直接报avalonia的错误

System.InvalidOperationException: Visual already has a parent
at Avalonia.Rendering.Composition.CompositionVisualCollection.OnBeforeAdded(CompositionVisual item)
at Avalonia.Visual.SynchronizeCompositionChildVisuals()
at Avalonia.Rendering.Composition.CompositingRenderer.UpdateCore()
at Avalonia.Rendering.Composition.CompositingRenderer.Update()
at Avalonia.Rendering.Composition.Compositor.CommitCore()
at Avalonia.Rendering.Composition.Compositor.Commit()
at Avalonia.Media.MediaContext.CommitCompositor(Compositor compositor)
at Avalonia.Media.MediaContext.CommitCompositorsWithThrottling()
at Avalonia.Media.MediaContext.RenderCore()
at Avalonia.Media.MediaContext.Render()
at Avalonia.Threading.DispatcherOperation.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.Win32.Win32Platform.WndProc(IntPtr hWnd, UInt32 msg, IntPtr wParam, IntPtr lParam)
at Avalonia.Win32.Interop.UnmanagedMethods.DispatchMessage(MSG& lpmsg)
at Avalonia.Win32.Win32DispatcherImpl.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 Client.Start.Program.Main(String[] args) in E:\Client.Start\Program.cs:line 37

[rabbitism]

如何复现呢？

[fintwx]

复现不了，不是每次都出现，把ursa源码集成过来，源码没有报错，问题还是出现 123 ***@***.***  

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