These are not prebuilt violations because they are source-built but according to @eerhardt we should not be shipping any ref-only assemblies in the source-built SDK.
<File Path="zfwzfb3h.eei/dotnet-sdk-6.0.100-fedora.34-x64.tar.22/sdk/6.0.100/DotnetTools/dotnet-format/Microsoft.Extensions.DependencyInjection.Abstractions.dll">
<Hash>4cd22a763ae5ec11f68f5f9ad23f8e5121cd64da6d4c95ac100d40e235e2f8dd</Hash>
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</File>
<File Path="zfwzfb3h.eei/dotnet-sdk-6.0.100-fedora.34-x64.tar.22/sdk/6.0.100/DotnetTools/dotnet-format/Microsoft.Extensions.DependencyInjection.dll">
<Hash>e0518b7f658f2187ce4cd1bbd07eaf94d9431492d0e148b957e067e7a99e0865</Hash>
<Type>Hash</Type>
<Match Package="/home/chris/tarball/packages/archive/art/SourceBuildReferencePackages/Microsoft.Extensions.DependencyInjection.5.0.0.nupkg" PackageId="Microsoft.Extensions.DependencyInjection" PackageVersion="5.0.0" File="lib/netstandard2.1/Microsoft.Extensions.DependencyInjection.dll" />
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<File Path="zfwzfb3h.eei/dotnet-sdk-6.0.100-fedora.34-x64.tar.22/sdk/6.0.100/DotnetTools/dotnet-format/Microsoft.Extensions.FileSystemGlobbing.dll">
<Hash>181aa27979399a17ddc3c8bf484475686c2d38a360bcf3f247fa0fe74cbb685d</Hash>
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<Match Package="/home/chris/tarball/packages/archive/art/SourceBuildReferencePackages/Microsoft.Extensions.FileSystemGlobbing.5.0.0.nupkg" PackageId="Microsoft.Extensions.FileSystemGlobbing" PackageVersion="5.0.0" File="lib/netstandard2.0/Microsoft.Extensions.FileSystemGlobbing.dll" />
</File>
<File Path="zfwzfb3h.eei/dotnet-sdk-6.0.100-fedora.34-x64.tar.22/sdk/6.0.100/DotnetTools/dotnet-format/Microsoft.Extensions.Logging.Abstractions.dll">
<Hash>38d2859fb03590b78fc0899a342e14fe3d51a1bacaf67e121c86c5376b8ca9f0</Hash>
<Type>Hash</Type>
<Match Package="/home/chris/tarball/packages/archive/art/SourceBuildReferencePackages/Microsoft.Extensions.Logging.Abstractions.5.0.0.nupkg" PackageId="Microsoft.Extensions.Logging.Abstractions" PackageVersion="5.0.0" File="lib/netstandard2.0/Microsoft.Extensions.Logging.Abstractions.dll" />
</File>
<File Path="zfwzfb3h.eei/dotnet-sdk-6.0.100-fedora.34-x64.tar.22/sdk/6.0.100/DotnetTools/dotnet-format/Microsoft.Extensions.Logging.dll">
<Hash>a94469a5bf84ad99ba0536a4128d8747230adc57159642d4d88c8d010c02fc8e</Hash>
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<Match Package="/home/chris/tarball/packages/archive/art/SourceBuildReferencePackages/Microsoft.Extensions.Logging.5.0.0.nupkg" PackageId="Microsoft.Extensions.Logging" PackageVersion="5.0.0" File="lib/netstandard2.1/Microsoft.Extensions.Logging.dll" />
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<File Path="zfwzfb3h.eei/dotnet-sdk-6.0.100-fedora.34-x64.tar.22/sdk/6.0.100/DotnetTools/dotnet-format/Microsoft.Extensions.Options.dll">
<Hash>e3442bb8734eeed373ed429f6e63986d7113e26d8c3c63accaac0d8fb6d973bb</Hash>
<Type>Hash</Type>
<Match Package="/home/chris/tarball/packages/archive/art/SourceBuildReferencePackages/Microsoft.Extensions.Options.5.0.0.nupkg" PackageId="Microsoft.Extensions.Options" PackageVersion="5.0.0" File="lib/netstandard2.0/Microsoft.Extensions.Options.dll" />
</File>
<File Path="zfwzfb3h.eei/dotnet-sdk-6.0.100-fedora.34-x64.tar.22/sdk/6.0.100/DotnetTools/dotnet-format/Microsoft.Extensions.Primitives.dll">
<Hash>07d6753911f634076277fab643550b523ff20a2f9daaeeff2759d75fa0a81eba</Hash>
<Type>Hash</Type>
<Match Package="/home/chris/tarball/packages/archive/art/SourceBuildReferencePackages/Microsoft.Extensions.Primitives.5.0.0.nupkg" PackageId="Microsoft.Extensions.Primitives" PackageVersion="5.0.0" File="lib/netcoreapp3.0/Microsoft.Extensions.Primitives.dll" />
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<File Path="zfwzfb3h.eei/dotnet-sdk-6.0.100-fedora.34-x64.tar.22/sdk/6.0.100/Sdks/Microsoft.NET.ILLink.Tasks/tools/net472/System.Buffers.dll">
<Hash>34445d3f590844adef31421046c9ba662e069a9081eed1e1a810ecb545854471</Hash>
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<Match Package="/home/chris/tarball/packages/archive/art/SourceBuildReferencePackages/System.Buffers.4.5.1.nupkg" PackageId="System.Buffers" PackageVersion="4.5.1" File="lib/net461/System.Buffers.dll" />
</File>
These are not prebuilt violations because they are source-built but according to @eerhardt we should not be shipping any ref-only assemblies in the source-built SDK.