Microsoft.Extensions.Configuration.Binder not binding property

[KnapSac]

Recently I ran into a discrepancy between the source generated binding behavior, and the regular reflection based behavior. Using the following code:

using Microsoft.Extensions.Configuration;

IConfigurationBuilder builder =
	new ConfigurationBuilder( )
		.AddInMemoryCollection(
		[
			new KeyValuePair< string, string ? >(
				"Settings:Test",
				bool.TrueString )
		] );
IConfiguration config = builder.Build( );

Settings settings = config.GetSection( "Settings" ).Get< Settings >( )!;

Console.WriteLine( $"Test: {settings.Test}" );

class Settings
{
	public bool Test { get; init; }
}

When I run this code using reflection based binding, the output is Test: True. However, if I set <EnableConfigurationBindingGenerator>true</EnableConfigurationBindingGenerator> in the .csproj file, the output is Test: False.

Am I misunderstanding the behavior/purpose of the source generator, or is this a bug?

I have tried this on both .NET 8 and .NET 9 Preview 5, this reproduces on both versions.

Dependencies:

    <PackageReference Include="Microsoft.Extensions.Configuration" Version="8.0.0" />
    <PackageReference Include="Microsoft.Extensions.Configuration.Binder" Version="8.0.1" />
    <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="8.0.0" />