• Only Net 4.7.2 (required since the application is a Visual Studio extension)
• Windows version: 20H2 19042.1237
• Does the bug reproduce also in WPF for .NET Framework 4.8?: Yes
• Is this bug related specifically to tooling in Visual Studio (e.g. XAML Designer, Code editing, etc...)? No

Problem description:
Application crash when scrolling a DataGrid with template columns. (ArgumentNullException in the DataGridItemAutomationPeer)

Actual behavior:
Application crash, stack trace can be found here: dotnet/ResXResourceManager#430

Expected behavior:
Scrolling works without crashing the application

Minimal repro:
Steps how to reproduce can be found here: dotnet/ResXResourceManager#430