Blame SOURCES/sdk-enable-preview.patch

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--- a/eng/SourceBuild.props
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+++ b/eng/SourceBuild.props
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@@ -8,6 +8,7 @@
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   <Target Name="ConfigureInnerBuildArg" BeforeTargets="GetSourceBuildCommandConfiguration">
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     <PropertyGroup>
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       <InnerBuildArgs>$(InnerBuildArgs) /p:Projects="$(InnerSourceBuildRepoRoot)\source-build.slnf"</InnerBuildArgs>
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+      <InnerBuildArgs>$(InnerBuildArgs) /p:EnablePreviewFeatures=true</InnerBuildArgs>
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     </PropertyGroup>
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   </Target>
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