diff --git a/Directory.Build.props b/Directory.Build.props
index 60a661e66ca444..ce67527ff8ed12 100644
--- a/Directory.Build.props
+++ b/Directory.Build.props
@@ -54,6 +54,7 @@
     <NetCoreAppCurrentBrandName>.NET $(NetCoreAppCurrentVersion)</NetCoreAppCurrentBrandName>
     <NetCoreAppCurrent>net$(NetCoreAppCurrentVersion)</NetCoreAppCurrent>
     <NetCoreAppMinimum>net6.0</NetCoreAppMinimum>
+    <NetCoreAppMinimum Condition="'$(DotNetBuildFromSource)' == 'true'">$(NetCoreAppCurrent)</NetCoreAppMinimum>
 
     <NetCoreAppToolCurrentVersion>7.0</NetCoreAppToolCurrentVersion>
     <NetCoreAppToolCurrent>net$(NetCoreAppToolCurrentVersion)</NetCoreAppToolCurrent>
diff --git a/eng/SourceBuild.props b/eng/SourceBuild.props
index c17838918f8cec..9ca390c502f757 100644
--- a/eng/SourceBuild.props
+++ b/eng/SourceBuild.props
@@ -39,6 +39,7 @@
       <InnerBuildArgs>$(InnerBuildArgs) /p:PortableBuild=$(SourceBuildPortable)</InnerBuildArgs>
       <InnerBuildArgs>$(InnerBuildArgs) /p:BuildDebPackage=false</InnerBuildArgs>
       <InnerBuildArgs>$(InnerBuildArgs) /p:EnableNgenOptimization=false</InnerBuildArgs>
+      <InnerBuildArgs>$(InnerBuildArgs) /p:EnablePackageValidation=false</InnerBuildArgs>
     </PropertyGroup>
   </Target>
 
diff --git a/src/libraries/System.Diagnostics.DiagnosticSource/src/System.Diagnostics.DiagnosticSource.csproj b/src/libraries/System.Diagnostics.DiagnosticSource/src/System.Diagnostics.DiagnosticSource.csproj
index 9c22bce30dae9b..6d40be2f856b75 100644
--- a/src/libraries/System.Diagnostics.DiagnosticSource/src/System.Diagnostics.DiagnosticSource.csproj
+++ b/src/libraries/System.Diagnostics.DiagnosticSource/src/System.Diagnostics.DiagnosticSource.csproj
@@ -6,8 +6,6 @@
     <NoWarn>$(NoWarn);SA1205;CA1845</NoWarn>
     <EnableTrimAnalyzer Condition="$([MSBuild]::GetTargetFrameworkIdentifier('$(TargetFramework)')) == '.NETFramework'">false</EnableTrimAnalyzer>
     <IsPackable>true</IsPackable>
-    <!-- Lifetime rules introduced in C# 11 impact scenarios in net6 framework -->
-    <LangVersion Condition="'$(TargetFramework)' == 'net6.0'">10</LangVersion>
     <EnableAOTAnalyzer>true</EnableAOTAnalyzer>
     <PackageDescription>Provides Classes that allow you to decouple code logging rich (unserializable) diagnostics/telemetry (e.g. framework) from code that consumes it (e.g. tools)
 
diff --git a/src/libraries/System.Text.RegularExpressions/tools/GenerateRegexCasingTable.csproj b/src/libraries/System.Text.RegularExpressions/tools/GenerateRegexCasingTable.csproj
index 26b5733684c3f5..4df90752204029 100644
--- a/src/libraries/System.Text.RegularExpressions/tools/GenerateRegexCasingTable.csproj
+++ b/src/libraries/System.Text.RegularExpressions/tools/GenerateRegexCasingTable.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
       <OutputType>Exe</OutputType>
-      <TargetFramework>net6.0</TargetFramework>
+      <TargetFramework>$(NetCoreAppToolCurrent)</TargetFramework>
       <LangVersion>latest</LangVersion>
       <Nullable>enable</Nullable>
   </PropertyGroup>