An error occurs when canceling C# durable project debugging via prompt dialog

[v-ruizh]

OS: Windows 11 Build Version: 20250613.1 .NET Version: 9.0.301 Regression: Not a regression

Repro Steps:

1. Create a .NET 9 Isolated C# durable project.
2. Debug the above project, a dialog pops up. Such as the below one.
3. Click "Cancel" or "X" button in the above dialog.
4. Check whether no error occurs.

Expect: No error occurs.

Actual: An error occurs.

More Info: This issue does not reproduce for JavaScript/TypeScript durable project.