TabControl tab get selected when a Button is pressed on a ToolBar

.NET Core Version: 3.0 (also .NET Framework 4.7.1 - 4.8 but not 4.6.2)
Windows version: 1903

1. Create a new WPF App and use the following XAML for the window (no extra code behind):

````xaml

Button






Button

````

2. Run the app and switch to the second Tab
3. Switch back to the first Tab and press Button

The TabControl changes the currently selected tab to the second tab while it's expected to stay on the first tab:


A workaround is to set focused element for the Window:

````xaml

Button






Button

````