Custom connection parameters don't seem to be working

[oliverkahrmann-basf]

I am following the description from the Readme and have implemented this parameters class:

	/// <summary>
	/// Connection parameters for SapNwRfc, with additional parameters we need.
	/// </summary>
	public class SapConnectionParametersExt : SapConnectionParameters {

		/// <summary>
		/// Specify whether to use SNC single sign-on or not if SNC is enabled. Possible values are:
		/// 0:  don't use SNC single sign-on
		/// 1:  use SNC single sign-on(default)
		/// </summary>
		[SapName("SNC_SSO")]
		public string SncSSO { get; set; } = "1";
	}

Usage is like this:

// Connection Parameters
var myParams = new SapConnectionParametersExt();

// Set other parameters here

myParams.SncSSO = "0";

var conn = new SapConnection(myParams);
conn.Connect();

From what I can see in the system audit logs, it still attempts an SSO connection (which fails for my specific use case => different user name).

The relevant code which works with the parameters always uses typeof(SapConnectionParameters) or an indirect version via type parameters which, to my knowledge, will never return the custom parameters on my subclass.
To support that, it would have to use parameters.GetType() to get the actual runtime type.