XAMLIL NRE for Style Selector

[aguahombre]

Using build 0.8.999-cibuild0003548-beta, I get a XAMLIL compiler NRE for the following XAML

<UserControl xmlns="https://github.com/avaloniaui"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
             mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
             x:Class="AvaloniaApplication7.Views.ViewA">
  <UserControl.Styles>
    <Style Selector=".large">
      <Setter Property="Background" Value="White"/>
    </Style>
  </UserControl.Styles>
  <TextBlock Text="{Binding UrlPathSegment}" Classes="large"/>
</UserControl>

Error	XAMLIL	Internal compiler error while emitting node Avalonia.Markup.Xaml.XamlIl.CompilerExtensions.Transformers.XamlIlOrSelectorNode:
System.NullReferenceException: Object reference not set to an instance of an object.
   at XamlIl.TypeSystem.XamlIlTypeSystemExtensions.EmitCall(IXamlIlEmitter emitter, IXamlIlMethod method, Boolean swallowResult) in D:\a\1\s\src\Markup\Avalonia.Markup.Xaml\XamlIl\xamlil.github\src\XamlIl\TypeSystem\TypeSystem.cs:line 474
   at Avalonia.Markup.Xaml.XamlIl.CompilerExtensions.Transformers.XamlIlSelectorNode.EmitCall(XamlIlEmitContext context, IXamlIlEmitter codeGen, Func`2 method) in D:\a\1\s\src\Markup\Avalonia.Markup.Xaml\XamlIl\CompilerExtensions\Transformers\AvaloniaXamlIlSelectorTransformer.cs:line 164
   at Avalonia.Markup.Xaml.XamlIl.CompilerExtensions.Transformers.XamlIlOrSelectorNode.DoEmit(XamlIlEmitContext context, IXamlIlEmitter codeGen) in D:\a\1\s\src\Markup\Avalonia.Markup.Xaml\XamlIl\CompilerExtensions\Transformers\AvaloniaXamlIlSelectorTransformer.cs:line 334
   a... Line 9, position 6.	AvaloniaApplication7	

The compiler error goes away if I change the selector to TextBlock.large