Invalid BAML generated

[drolevar]

Description

When I build an app containing the following XAML with 9.0.0-preview.7, it's compiled into an unreadable BAML:

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">

    <Style x:Key="DefaultAccessTextStyle" TargetType="{x:Type AccessText}">
        <Setter Property="Background" Value="Transparent" />
        <Setter Property="FontSize" Value="14" />
        <Setter Property="Margin" Value="0" />
        <Setter Property="Focusable" Value="False" />
        <Setter Property="SnapsToDevicePixels" Value="True" />
        <Setter Property="OverridesDefaultStyle" Value="True" />
    </Style>

    <Style
        x:Key="{x:Type AccessText}"
        BasedOn="{StaticResource DefaultAccessTextStyle}"
        TargetType="{x:Type AccessText}" />

</ResourceDictionary>

Reproduction Steps

Build and run the attached project:

WpfApp1.zip

Expected behavior

Windows is shown:

Actual behavior

Exception is thrown:

Regression?

This has worked with NET 8.0.

Known Workarounds

No response

Impact

Cannot build with .NET 9.0.0-preview.7.

Configuration

No response

Other information

No response

[miloush]

Duplicate of #9582 (and #9620). Fixed in RC by #9584.

[drolevar]

@miloush Ok. Closing issue.