Cannot successfully assign a ListViewItem to a specified group in PropertyGrid

• .NET Core Version: 5.0.100-preview.7.20311.17

• Have you experienced this same bug with .NET Framework?: Yes

Problem description: The setting is not successfully, the Group property was return to ‘(none)’ after clicking OK button.

More Info:

1. This issue is not a regression, can reproduce from .NET3.5 ~.NET4.8 in classic project and from .NET core 3.0 ~.NET 5.0 in Core project.
2. This issue is not reproducing when setting the Group property in designer properties window.

Expected behavior: The Group property should be set successfully.

Minimal repro:

1. Create a Winforms core project.
2. Drag and drop a PropertyGrid and a ListView control to Form.
3. Add following code in InitializeComponent() part.

   public Form1()
   {
       InitializeComponent();
       propertyGrid1.SelectedObject = listView1; // <--
   }
   

4. Build and run.
5. Add one ListViewGroup that Header is Group1 by clicking the browser button next to the Groups property of ListView.
6. Add one ListViewItem that Text is Item1 by clicking the browser button next to the Items property of ListView.
7. Find the Group property of the Item1, and set to ‘Group1’.
8. Click OK button in ListViewItem Collection Editor.

Or

1. Run the attached project. SetGroupProperty.zip
2. Repeat the above step5~8.