A list of assemblies compiled by @tmds in #3571 (comment) shows the set of reference assemblies that currently exist in the SB SDK and are represented as implementation assemblies in the MSFT SDK:
sdk/8.0.100-preview.7.23376.1/Microsoft.Win32.SystemEvents.dll
sdk/8.0.100-preview.7.23376.1/System.ComponentModel.Composition.dll
sdk/8.0.100-preview.7.23376.1/System.Drawing.Common.dll
sdk/8.0.100-preview.7.23376.1/System.Security.Permissions.dll
sdk/8.0.100-preview.7.23376.1/System.Windows.Extensions.dll
sdk/8.0.100-preview.7.23376.1/FSharp/Microsoft.Win32.SystemEvents.dll
sdk/8.0.100-preview.7.23376.1/FSharp/System.CodeDom.dll
sdk/8.0.100-preview.7.23376.1/FSharp/System.Drawing.Common.dll
sdk/8.0.100-preview.7.23376.1/FSharp/System.Resources.Extensions.dll
sdk/8.0.100-preview.7.23376.1/FSharp/System.Security.Cryptography.Xml.dll
sdk/8.0.100-preview.7.23376.1/FSharp/System.Security.Permissions.dll
sdk/8.0.100-preview.7.23376.1/FSharp/System.Windows.Extensions.dll
sdk/8.0.100-preview.7.23376.1/DotnetTools/dotnet-format/Microsoft.Extensions.DependencyInjection.Abstractions.dll
sdk/8.0.100-preview.7.23376.1/DotnetTools/dotnet-format/Microsoft.Extensions.DependencyInjection.dll
sdk/8.0.100-preview.7.23376.1/DotnetTools/dotnet-format/Microsoft.Extensions.FileSystemGlobbing.dll
sdk/8.0.100-preview.7.23376.1/DotnetTools/dotnet-format/Microsoft.Extensions.Logging.Abstractions.dll
sdk/8.0.100-preview.7.23376.1/DotnetTools/dotnet-format/Microsoft.Extensions.Logging.dll
sdk/8.0.100-preview.7.23376.1/DotnetTools/dotnet-format/Microsoft.Extensions.Options.dll
sdk/8.0.100-preview.7.23376.1/DotnetTools/dotnet-format/Microsoft.Extensions.Primitives.dll
sdk/8.0.100-preview.7.23376.1/DotnetTools/dotnet-format/System.IO.Pipelines.dll
sdk/8.0.100-preview.7.23376.1/Containers/tasks/net8.0/Microsoft.Win32.SystemEvents.dll
sdk/8.0.100-preview.7.23376.1/Containers/tasks/net8.0/System.Drawing.Common.dll
sdk/8.0.100-preview.7.23376.1/Containers/tasks/net8.0/System.Security.Permissions.dll
sdk/8.0.100-preview.7.23376.1/Containers/tasks/net8.0/System.Windows.Extensions.dll
We should investigate this list to determine if there is any functional significance to the existence of these. One way to investigate this is to compare this list to the 7.0 SB SDK which has already been vetted and should, in theory, have rooted out any potential issue with the existence of a ref assembly.
One issue already known from this list is System.Security.Permissions: dotnet/msbuild#9158
A list of assemblies compiled by @tmds in #3571 (comment) shows the set of reference assemblies that currently exist in the SB SDK and are represented as implementation assemblies in the MSFT SDK:
We should investigate this list to determine if there is any functional significance to the existence of these. One way to investigate this is to compare this list to the 7.0 SB SDK which has already been vetted and should, in theory, have rooted out any potential issue with the existence of a ref assembly.
One issue already known from this list is System.Security.Permissions: dotnet/msbuild#9158