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Call to ParkingWindow.RemoveReflectChild() causes Cross-thread exception under load

See original GitHub issue

.NET Core Version:

Version: 5.0.0-alpha.1.20072.3

Have you experienced this same bug with .NET Framework?: No

Problem description:

Call to ParkingWindow.RemoveReflectChild() causes Cross-thread exception under load

Expected behavior: There should be no error when GC frees the resources.

Minimal repro: Run WinForms app under load and trigger GC to free resources.

System.InvalidOperationException: 'Cross-thread operation not valid: Control '' accessed from a thread other than the thread it was created on.'
>	System.Windows.Forms.dll!System.Windows.Forms.Control.Handle.get() Line 2502	C#
 	System.Windows.Forms.Primitives.dll!Interop.User32.GetWindowThreadProcessId(IHandle hWnd, out uint lpdwProcessId) Line 17	C#
 	System.Windows.Forms.dll!System.Windows.Forms.Application.ParkingWindow.RemoveReflectChild() Line 81	C#
 	System.Windows.Forms.dll!System.Windows.Forms.Control.ReflectParent.set(System.Windows.Forms.Control value) Line 3137	C#
 	System.Windows.Forms.dll!System.Windows.Forms.Control.UpdateReflectParent(bool findNewParent) Line 11630	C#
 	System.Windows.Forms.dll!System.Windows.Forms.Control.Dispose(bool disposing) Line 5188	C#
 	System.ComponentModel.Primitives.dll!System.ComponentModel.Component.~Component() Line 22	C#
 	[Native to Managed Transition]