diff --git a/src/Configuration.KeyPerFile/ref/Microsoft.Extensions.Configuration.KeyPerFile.csproj b/src/Configuration.KeyPerFile/ref/Microsoft.Extensions.Configuration.KeyPerFile.csproj
index 8dbe6d3ba1..b554afa715 100644
--- a/src/Configuration.KeyPerFile/ref/Microsoft.Extensions.Configuration.KeyPerFile.csproj
+++ b/src/Configuration.KeyPerFile/ref/Microsoft.Extensions.Configuration.KeyPerFile.csproj
@@ -2,15 +2,16 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <TargetFrameworks>netstandard2.0;$(DefaultNetCoreTargetFramework)</TargetFrameworks>
+    <TargetFrameworks Condition="'$(DotNetBuildFromSource)' == 'true'">$(DefaultNetCoreTargetFramework)</TargetFrameworks>
   </PropertyGroup>
   <ItemGroup Condition="'$(TargetFramework)' == 'netstandard2.0'">
     <Compile Include="Microsoft.Extensions.Configuration.KeyPerFile.netstandard2.0.cs" />
-    <Reference Include="Microsoft.Extensions.Configuration"  />
-    <Reference Include="Microsoft.Extensions.FileProviders.Physical"  />
+    <Reference Include="Microsoft.Extensions.Configuration" />
+    <Reference Include="Microsoft.Extensions.FileProviders.Physical" />
   </ItemGroup>
 <ItemGroup Condition="'$(TargetFramework)' == '$(DefaultNetCoreTargetFramework)'">
     <Compile Include="Microsoft.Extensions.Configuration.KeyPerFile.netcoreapp.cs" />
-    <Reference Include="Microsoft.Extensions.Configuration"  />
-    <Reference Include="Microsoft.Extensions.FileProviders.Physical"  />
+    <Reference Include="Microsoft.Extensions.Configuration" />
+    <Reference Include="Microsoft.Extensions.FileProviders.Physical" />
   </ItemGroup>
 </Project>
diff --git a/src/FileProviders/Embedded/ref/Microsoft.Extensions.FileProviders.Embedded.csproj b/src/FileProviders/Embedded/ref/Microsoft.Extensions.FileProviders.Embedded.csproj
index 89cba5ba57..fcca2039f7 100644
--- a/src/FileProviders/Embedded/ref/Microsoft.Extensions.FileProviders.Embedded.csproj
+++ b/src/FileProviders/Embedded/ref/Microsoft.Extensions.FileProviders.Embedded.csproj
@@ -2,13 +2,16 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <TargetFrameworks>netstandard2.0;$(DefaultNetCoreTargetFramework)</TargetFrameworks>
+    <TargetFrameworks Condition="'$(DotNetBuildFromSource)' == 'true'">$(DefaultNetCoreTargetFramework)</TargetFrameworks>
   </PropertyGroup>
   <ItemGroup Condition="'$(TargetFramework)' == 'netstandard2.0'">
     <Compile Include="Microsoft.Extensions.FileProviders.Embedded.netstandard2.0.cs" />
-    <Reference Include="Microsoft.Extensions.FileProviders.Abstractions"  />
+    <Reference Include="Microsoft.Extensions.FileProviders.Abstractions" />
+    <InternalsVisibleTo Include="Microsoft.Extensions.FileProviders.Embedded.Tests" Key="" />
   </ItemGroup>
 <ItemGroup Condition="'$(TargetFramework)' == '$(DefaultNetCoreTargetFramework)'">
     <Compile Include="Microsoft.Extensions.FileProviders.Embedded.netcoreapp.cs" />
-    <Reference Include="Microsoft.Extensions.FileProviders.Abstractions"  />
+    <Reference Include="Microsoft.Extensions.FileProviders.Abstractions" />
+    <InternalsVisibleTo Include="Microsoft.Extensions.FileProviders.Embedded.Tests" Key="" />
   </ItemGroup>
 </Project>
diff --git a/src/HealthChecks/Abstractions/ref/Microsoft.Extensions.Diagnostics.HealthChecks.Abstractions.csproj b/src/HealthChecks/Abstractions/ref/Microsoft.Extensions.Diagnostics.HealthChecks.Abstractions.csproj
index 6b67a08686..8be8d278db 100644
--- a/src/HealthChecks/Abstractions/ref/Microsoft.Extensions.Diagnostics.HealthChecks.Abstractions.csproj
+++ b/src/HealthChecks/Abstractions/ref/Microsoft.Extensions.Diagnostics.HealthChecks.Abstractions.csproj
@@ -2,13 +2,12 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <TargetFrameworks>netstandard2.0;$(DefaultNetCoreTargetFramework)</TargetFrameworks>
+    <TargetFrameworks Condition="'$(DotNetBuildFromSource)' == 'true'">$(DefaultNetCoreTargetFramework)</TargetFrameworks>
   </PropertyGroup>
   <ItemGroup Condition="'$(TargetFramework)' == 'netstandard2.0'">
     <Compile Include="Microsoft.Extensions.Diagnostics.HealthChecks.Abstractions.netstandard2.0.cs" />
-    
   </ItemGroup>
 <ItemGroup Condition="'$(TargetFramework)' == '$(DefaultNetCoreTargetFramework)'">
     <Compile Include="Microsoft.Extensions.Diagnostics.HealthChecks.Abstractions.netcoreapp.cs" />
-    
   </ItemGroup>
 </Project>
diff --git a/src/HealthChecks/HealthChecks/ref/Microsoft.Extensions.Diagnostics.HealthChecks.csproj b/src/HealthChecks/HealthChecks/ref/Microsoft.Extensions.Diagnostics.HealthChecks.csproj
index 83dae521fb..d6b79361e7 100644
--- a/src/HealthChecks/HealthChecks/ref/Microsoft.Extensions.Diagnostics.HealthChecks.csproj
+++ b/src/HealthChecks/HealthChecks/ref/Microsoft.Extensions.Diagnostics.HealthChecks.csproj
@@ -2,17 +2,20 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <TargetFrameworks>netstandard2.0;$(DefaultNetCoreTargetFramework)</TargetFrameworks>
+    <TargetFrameworks Condition="'$(DotNetBuildFromSource)' == 'true'">$(DefaultNetCoreTargetFramework)</TargetFrameworks>
   </PropertyGroup>
   <ItemGroup Condition="'$(TargetFramework)' == 'netstandard2.0'">
     <Compile Include="Microsoft.Extensions.Diagnostics.HealthChecks.netstandard2.0.cs" />
-    <Reference Include="Microsoft.Extensions.Diagnostics.HealthChecks.Abstractions"  />
-    <Reference Include="Microsoft.Extensions.Hosting.Abstractions"  />
-    <Reference Include="Microsoft.Extensions.Options"  />
+    <Reference Include="Microsoft.Extensions.Diagnostics.HealthChecks.Abstractions" />
+    <Reference Include="Microsoft.Extensions.Hosting.Abstractions" />
+    <Reference Include="Microsoft.Extensions.Options" />
+    <InternalsVisibleTo Include="Microsoft.Extensions.Diagnostics.HealthChecks.Tests" Key="" />
   </ItemGroup>
 <ItemGroup Condition="'$(TargetFramework)' == '$(DefaultNetCoreTargetFramework)'">
     <Compile Include="Microsoft.Extensions.Diagnostics.HealthChecks.netcoreapp.cs" />
-    <Reference Include="Microsoft.Extensions.Diagnostics.HealthChecks.Abstractions"  />
-    <Reference Include="Microsoft.Extensions.Hosting.Abstractions"  />
-    <Reference Include="Microsoft.Extensions.Options"  />
+    <Reference Include="Microsoft.Extensions.Diagnostics.HealthChecks.Abstractions" />
+    <Reference Include="Microsoft.Extensions.Hosting.Abstractions" />
+    <Reference Include="Microsoft.Extensions.Options" />
+    <InternalsVisibleTo Include="Microsoft.Extensions.Diagnostics.HealthChecks.Tests" Key="" />
   </ItemGroup>
 </Project>
diff --git a/src/JSInterop/Microsoft.JSInterop/ref/Microsoft.JSInterop.csproj b/src/JSInterop/Microsoft.JSInterop/ref/Microsoft.JSInterop.csproj
index ceb24636ab..52192f2100 100644
--- a/src/JSInterop/Microsoft.JSInterop/ref/Microsoft.JSInterop.csproj
+++ b/src/JSInterop/Microsoft.JSInterop/ref/Microsoft.JSInterop.csproj
@@ -2,13 +2,15 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <TargetFrameworks>netstandard2.0;$(DefaultNetCoreTargetFramework)</TargetFrameworks>
+    <TargetFrameworks Condition="'$(DotNetBuildFromSource)' == 'true'">$(DefaultNetCoreTargetFramework)</TargetFrameworks>
   </PropertyGroup>
   <ItemGroup Condition="'$(TargetFramework)' == 'netstandard2.0'">
     <Compile Include="Microsoft.JSInterop.netstandard2.0.cs" />
-    <Reference Include="System.Text.Json"  />
+    <Reference Include="System.Text.Json" />
+    <InternalsVisibleTo Include="Microsoft.JSInterop.Tests" Key="" />
   </ItemGroup>
 <ItemGroup Condition="'$(TargetFramework)' == '$(DefaultNetCoreTargetFramework)'">
     <Compile Include="Microsoft.JSInterop.netcoreapp.cs" />
-    
+    <InternalsVisibleTo Include="Microsoft.JSInterop.Tests" Key="" />
   </ItemGroup>
 </Project>
diff --git a/src/Localization/Abstractions/ref/Microsoft.Extensions.Localization.Abstractions.csproj b/src/Localization/Abstractions/ref/Microsoft.Extensions.Localization.Abstractions.csproj
index af97cae594..a6ffa6ada6 100644
--- a/src/Localization/Abstractions/ref/Microsoft.Extensions.Localization.Abstractions.csproj
+++ b/src/Localization/Abstractions/ref/Microsoft.Extensions.Localization.Abstractions.csproj
@@ -2,13 +2,12 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <TargetFrameworks>netstandard2.0;$(DefaultNetCoreTargetFramework)</TargetFrameworks>
+    <TargetFrameworks Condition="'$(DotNetBuildFromSource)' == 'true'">$(DefaultNetCoreTargetFramework)</TargetFrameworks>
   </PropertyGroup>
   <ItemGroup Condition="'$(TargetFramework)' == 'netstandard2.0'">
     <Compile Include="Microsoft.Extensions.Localization.Abstractions.netstandard2.0.cs" />
-    
   </ItemGroup>
 <ItemGroup Condition="'$(TargetFramework)' == '$(DefaultNetCoreTargetFramework)'">
     <Compile Include="Microsoft.Extensions.Localization.Abstractions.netcoreapp.cs" />
-    
   </ItemGroup>
 </Project>
diff --git a/src/Localization/Localization/ref/Microsoft.Extensions.Localization.csproj b/src/Localization/Localization/ref/Microsoft.Extensions.Localization.csproj
index 67e8f38f89..b20502c893 100644
--- a/src/Localization/Localization/ref/Microsoft.Extensions.Localization.csproj
+++ b/src/Localization/Localization/ref/Microsoft.Extensions.Localization.csproj
@@ -2,19 +2,22 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <TargetFrameworks>netstandard2.0;$(DefaultNetCoreTargetFramework)</TargetFrameworks>
+    <TargetFrameworks Condition="'$(DotNetBuildFromSource)' == 'true'">$(DefaultNetCoreTargetFramework)</TargetFrameworks>
   </PropertyGroup>
   <ItemGroup Condition="'$(TargetFramework)' == 'netstandard2.0'">
     <Compile Include="Microsoft.Extensions.Localization.netstandard2.0.cs" />
-    <Reference Include="Microsoft.Extensions.DependencyInjection.Abstractions"  />
-    <Reference Include="Microsoft.Extensions.Options"  />
-    <Reference Include="Microsoft.Extensions.Localization.Abstractions"  />
-    <Reference Include="Microsoft.Extensions.Logging.Abstractions"  />
+    <Reference Include="Microsoft.Extensions.DependencyInjection.Abstractions" />
+    <Reference Include="Microsoft.Extensions.Options" />
+    <Reference Include="Microsoft.Extensions.Localization.Abstractions" />
+    <Reference Include="Microsoft.Extensions.Logging.Abstractions" />
+    <InternalsVisibleTo Include="Microsoft.Extensions.Localization.Tests" Key="" />
   </ItemGroup>
 <ItemGroup Condition="'$(TargetFramework)' == '$(DefaultNetCoreTargetFramework)'">
     <Compile Include="Microsoft.Extensions.Localization.netcoreapp.cs" />
-    <Reference Include="Microsoft.Extensions.DependencyInjection.Abstractions"  />
-    <Reference Include="Microsoft.Extensions.Options"  />
-    <Reference Include="Microsoft.Extensions.Localization.Abstractions"  />
-    <Reference Include="Microsoft.Extensions.Logging.Abstractions"  />
+    <Reference Include="Microsoft.Extensions.DependencyInjection.Abstractions" />
+    <Reference Include="Microsoft.Extensions.Options" />
+    <Reference Include="Microsoft.Extensions.Localization.Abstractions" />
+    <Reference Include="Microsoft.Extensions.Logging.Abstractions" />
+    <InternalsVisibleTo Include="Microsoft.Extensions.Localization.Tests" Key="" />
   </ItemGroup>
 </Project>
diff --git a/src/ObjectPool/ref/Microsoft.Extensions.ObjectPool.csproj b/src/ObjectPool/ref/Microsoft.Extensions.ObjectPool.csproj
index be298e7ae3..2755e1d1cf 100644
--- a/src/ObjectPool/ref/Microsoft.Extensions.ObjectPool.csproj
+++ b/src/ObjectPool/ref/Microsoft.Extensions.ObjectPool.csproj
@@ -2,13 +2,14 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <TargetFrameworks>netstandard2.0;$(DefaultNetCoreTargetFramework)</TargetFrameworks>
+    <TargetFrameworks Condition="'$(DotNetBuildFromSource)' == 'true'">$(DefaultNetCoreTargetFramework)</TargetFrameworks>
   </PropertyGroup>
   <ItemGroup Condition="'$(TargetFramework)' == 'netstandard2.0'">
     <Compile Include="Microsoft.Extensions.ObjectPool.netstandard2.0.cs" />
-    
+    <InternalsVisibleTo Include="Microsoft.Extensions.ObjectPool.Tests" Key="" />
   </ItemGroup>
 <ItemGroup Condition="'$(TargetFramework)' == '$(DefaultNetCoreTargetFramework)'">
     <Compile Include="Microsoft.Extensions.ObjectPool.netcoreapp.cs" />
-    
+    <InternalsVisibleTo Include="Microsoft.Extensions.ObjectPool.Tests" Key="" />
   </ItemGroup>
 </Project>
diff --git a/src/Shared/test/Shared.Tests/Microsoft.AspNetCore.Shared.Tests.csproj b/src/Shared/test/Shared.Tests/Microsoft.AspNetCore.Shared.Tests.csproj
index a18aa0246b..bc6eb225c1 100644
--- a/src/Shared/test/Shared.Tests/Microsoft.AspNetCore.Shared.Tests.csproj
+++ b/src/Shared/test/Shared.Tests/Microsoft.AspNetCore.Shared.Tests.csproj
@@ -12,7 +12,6 @@
     <Compile Include="$(SharedSourceRoot)CommandLineUtils\**\*.cs" Link="Shared\CommandLineUtils\%(Filename)%(Extension)"/>
     <Compile Include="$(SharedSourceRoot)ClosedGenericMatcher\*.cs" Link="Shared\ClosedGenericMatcher\%(Filename)%(Extension)"/>
     <Compile Include="$(SharedSourceRoot)CopyOnWriteDictionary\*.cs" Link="Shared\CopyOnWriteDictionary\%(Filename)%(Extension)"/>
-    <Compile Include="$(SharedSourceRoot)runtime\**\*.cs" Link="Shared\runtime\%(Filename)%(Extension)"/>
     <Compile Include="$(SharedSourceRoot)HashCodeCombiner\**\*.cs" Link="Shared\HashCodeCombiner\%(Filename)%(Extension)"/>
     <Compile Include="$(SharedSourceRoot)HostFactoryResolver\**\*.cs" Link="Shared\HostFactoryResolver\%(Filename)%(Extension)"/>
     <Compile Include="$(SharedSourceRoot)runtime\*.cs" Link="Shared\runtime\%(Filename)%(Extension)"/>
diff --git a/src/WebEncoders/ref/Microsoft.Extensions.WebEncoders.csproj b/src/WebEncoders/ref/Microsoft.Extensions.WebEncoders.csproj
index 5beee97dd6..4fbb9b15e3 100644
--- a/src/WebEncoders/ref/Microsoft.Extensions.WebEncoders.csproj
+++ b/src/WebEncoders/ref/Microsoft.Extensions.WebEncoders.csproj
@@ -2,16 +2,17 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <TargetFrameworks>netstandard2.0;$(DefaultNetCoreTargetFramework)</TargetFrameworks>
+    <TargetFrameworks Condition="'$(DotNetBuildFromSource)' == 'true'">$(DefaultNetCoreTargetFramework)</TargetFrameworks>
   </PropertyGroup>
   <ItemGroup Condition="'$(TargetFramework)' == 'netstandard2.0'">
     <Compile Include="Microsoft.Extensions.WebEncoders.netstandard2.0.cs" />
-    <Reference Include="Microsoft.Extensions.DependencyInjection.Abstractions"  />
-    <Reference Include="Microsoft.Extensions.Options"  />
-    <Reference Include="System.Text.Encodings.Web"  />
+    <Reference Include="Microsoft.Extensions.DependencyInjection.Abstractions" />
+    <Reference Include="Microsoft.Extensions.Options" />
+    <Reference Include="System.Text.Encodings.Web" />
   </ItemGroup>
 <ItemGroup Condition="'$(TargetFramework)' == '$(DefaultNetCoreTargetFramework)'">
     <Compile Include="Microsoft.Extensions.WebEncoders.netcoreapp.cs" />
-    <Reference Include="Microsoft.Extensions.DependencyInjection.Abstractions"  />
-    <Reference Include="Microsoft.Extensions.Options"  />
+    <Reference Include="Microsoft.Extensions.DependencyInjection.Abstractions" />
+    <Reference Include="Microsoft.Extensions.Options" />
   </ItemGroup>
 </Project>