WinFormsComInterop.SourceGenerator does not work with Type StringBuilder

[ghost]

WinFormsComInterop.SourceGenerator does not work with argument type StringBuilder.

Test interface:
Interface IQueryAssociations

https://www.pinvoke.net/default.aspx/shlwapi/AssocCreate.html
https://learn.microsoft.com/en-us/windows/win32/api/shlwapi/nn-shlwapi-iqueryassociations

In method:
void GetString(
[In] ASSOCF flags,
[In] ASSOCSTR str,
[In, MarshalAs(UnmanagedType.LPWStr)] string pwszExtra,
[Out, MarshalAs(UnmanagedType.LPWStr)] StringBuilder pwszOut,
[In, Out] ref int pcchOut);

It has a StringBuilder argument type. If you compile this interface, Visual Studio will prompt an error:
Error CS8894 Cannot use 'StringBuilder' as a parameter type on a method attributed with 'UnmanagedCallersOnly'.