nameof for record Constructor Parameter not working

**Version Used**: .net9 latest

**Steps to Reproduce**:

i have this record and want to tell the compiler that TestString is not null when the boolean is true.

I get an error that TestString does not exist in the current context

```c#
public record Test(string? TestString, [property: MemberNotNullWhen(true, nameof(TestString))]bool IsTestString);
```

switchting to

```c#
public record Test(string? TestString, [property: MemberNotNullWhen(true, "TestString"))]bool IsTestString);
```
works as expected