DecompilerSettings.ExtensionMethods = false; Dosen't work

[naratteu]

Input code

Add-Type -TypeDefinition @"
public static class HelloWorld
{
    public static void Main() => "Hello World!".Say();
    static void Say(this string msg) => System.Console.WriteLine("Hello, World!");
}
"@ -OutputAssembly "HelloWorld.dll"

#r "nuget: ICSharpCode.Decompiler, 9.0.0.7833-preview3"
using ICSharpCode.Decompiler;
using ICSharpCode.Decompiler.CSharp;
DecompilerSettings s = new(){ ExtensionMethods = false };
var dll = "HelloWorld.dll";
return new CSharpDecompiler(dll, s).DecompileWholeModuleAsString();

Erroneous output

using System;
using System.Diagnostics;
using System.Reflection;
using System.Runtime.CompilerServices;

[assembly: CompilationRelaxations(8)]
[assembly: RuntimeCompatibility(WrapNonExceptionThrows = true)]
[assembly: Debuggable(DebuggableAttribute.DebuggingModes.Default | DebuggableAttribute.DebuggingModes.DisableOptimizations | DebuggableAttribute.DebuggingModes.IgnoreSymbolStoreSequencePoints | DebuggableAttribute.DebuggingModes.EnableEditAndContinue)]
[assembly: AssemblyVersion("0.0.0.0")]
[module: RefSafetyRules(11)]
public static class HelloWorld
{
	public static void Main()
	{
		"Hello World!".Say();
	}

	private static void Say(this string msg)
	{
		Console.WriteLine("Hello, World!");
	}
}

Correct output

#3356
this above commit solved it.

using System;
using System.Diagnostics;
using System.Reflection;
using System.Runtime.CompilerServices;

[assembly: Extension]
[assembly: CompilationRelaxations(8)]
[assembly: RuntimeCompatibility(WrapNonExceptionThrows = true)]
[assembly: Debuggable(DebuggableAttribute.DebuggingModes.Default | DebuggableAttribute.DebuggingModes.DisableOptimizations | DebuggableAttribute.DebuggingModes.IgnoreSymbolStoreSequencePoints | DebuggableAttribute.DebuggingModes.EnableEditAndContinue)]
[assembly: AssemblyVersion("0.0.0.0")]
[module: RefSafetyRules(11)]
[Extension]
public static class HelloWorld
{
	public static void Main()
	{
		Say("Hello World!");
	}

	[Extension]
	private static void Say(string msg)
	{
		Console.WriteLine("Hello, World!");
	}
}