DataTemplate doesn't support its datatype to self-refer.

[yaoyisen]

Describe the bug

I tried to show a computing expression like ((1 + 2) + 3) using a ContentControl and DataTemplates. But error occurred when a DataTemplate contained a child using the same template as itself.
As comparison, it works well when the adding expression doen't contains an adding expression as its child.

Steps to reproduce the bug

check the sample code

Expected behavior

No response

Screenshots

NuGet package version

WinUI 3 - Windows App SDK 1.5.0: 1.5.240227000

Windows version

No response

Additional context

sample.zip

[yaoyisen]

Any information about this issue?