diff --git a/src/installer/tests/AppHost.Bundle.Tests/AppHost.Bundle.Tests.csproj b/src/installer/tests/AppHost.Bundle.Tests/AppHost.Bundle.Tests.csproj
index 51433527076fd0..28fc7ae3878f6a 100644
--- a/src/installer/tests/AppHost.Bundle.Tests/AppHost.Bundle.Tests.csproj
+++ b/src/installer/tests/AppHost.Bundle.Tests/AppHost.Bundle.Tests.csproj
@@ -9,9 +9,6 @@
     <GenerateRuntimeConfigurationFiles>true</GenerateRuntimeConfigurationFiles>
     <!-- Reduce the length of the test output dir to make it more reliable on Windows. -->
     <TestsOutputName>ahb</TestsOutputName>
-    <!-- NuGet warns about a transitive P2P to System.Text.Json that can't be pruned.
-         This is a false positive: https://github.com/NuGet/Home/issues/14103 -->
-    <NoWarn>$(NoWarn);NU1511;xUnit1004</NoWarn>
     <TestRunnerName>XUnitV3</TestRunnerName>
   </PropertyGroup>
 
diff --git a/src/installer/tests/HostActivation.Tests/HostActivation.Tests.csproj b/src/installer/tests/HostActivation.Tests/HostActivation.Tests.csproj
index 6202c71150c9f6..4d57d852a467a9 100644
--- a/src/installer/tests/HostActivation.Tests/HostActivation.Tests.csproj
+++ b/src/installer/tests/HostActivation.Tests/HostActivation.Tests.csproj
@@ -8,9 +8,6 @@
     <GenerateRuntimeConfigurationFiles>true</GenerateRuntimeConfigurationFiles>
     <!-- Reduce the length of the test output dir to make it more reliable on Windows. -->
     <TestsOutputName>ha</TestsOutputName>
-    <!-- NuGet warns about a transitive P2P to System.Text.Json that can't be pruned.
-         This is a false positive: https://github.com/NuGet/Home/issues/14103 -->
-    <NoWarn>$(NoWarn);NU1511</NoWarn>
     <TestRunnerName>XUnitV3</TestRunnerName>
   </PropertyGroup>
 
diff --git a/src/installer/tests/Microsoft.DotNet.CoreSetup.Packaging.Tests/Microsoft.DotNet.CoreSetup.Packaging.Tests.csproj b/src/installer/tests/Microsoft.DotNet.CoreSetup.Packaging.Tests/Microsoft.DotNet.CoreSetup.Packaging.Tests.csproj
index 65fba58869bf6d..f2d6fa5a2009af 100644
--- a/src/installer/tests/Microsoft.DotNet.CoreSetup.Packaging.Tests/Microsoft.DotNet.CoreSetup.Packaging.Tests.csproj
+++ b/src/installer/tests/Microsoft.DotNet.CoreSetup.Packaging.Tests/Microsoft.DotNet.CoreSetup.Packaging.Tests.csproj
@@ -6,9 +6,6 @@
     <!-- Package tests run on the host, not the target -->
     <RuntimeIdentifier>$(HostRid)</RuntimeIdentifier>
     <IsPackable>false</IsPackable>
-    <!-- NuGet warns about a transitive P2P to System.Text.Json that can't be pruned.
-         This is a false positive: https://github.com/NuGet/Home/issues/14103 -->
-    <NoWarn>$(NoWarn);NU1511</NoWarn>
     <TestRunnerName>XUnitV3</TestRunnerName>
   </PropertyGroup>
 
diff --git a/src/installer/tests/Microsoft.NET.HostModel.Tests/Microsoft.NET.HostModel.Tests.csproj b/src/installer/tests/Microsoft.NET.HostModel.Tests/Microsoft.NET.HostModel.Tests.csproj
index 4dc86ad3257743..c3e488a0bf4496 100644
--- a/src/installer/tests/Microsoft.NET.HostModel.Tests/Microsoft.NET.HostModel.Tests.csproj
+++ b/src/installer/tests/Microsoft.NET.HostModel.Tests/Microsoft.NET.HostModel.Tests.csproj
@@ -8,9 +8,6 @@
     <GenerateRuntimeConfigurationFiles>true</GenerateRuntimeConfigurationFiles>
     <!-- Reduce the length of the test output dir to make it more reliable on Windows. -->
     <TestsOutputName>hm</TestsOutputName>
-    <!-- NuGet warns about a transitive P2P to System.Text.Json that can't be pruned.
-         This is a false positive: https://github.com/NuGet/Home/issues/14103 -->
-    <NoWarn>$(NoWarn);NU1511;xUnit1004</NoWarn>
     <TestRunnerName>XUnitV3</TestRunnerName>
   </PropertyGroup>
 
diff --git a/src/installer/tests/TestUtils/TestUtils.csproj b/src/installer/tests/TestUtils/TestUtils.csproj
index a88b817b47ac5b..579b220196a042 100644
--- a/src/installer/tests/TestUtils/TestUtils.csproj
+++ b/src/installer/tests/TestUtils/TestUtils.csproj
@@ -5,9 +5,6 @@
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <AssemblyName>TestUtils</AssemblyName>
     <PackageId>TestUtils</PackageId>
-    <!-- NuGet warns about a transitive P2P to System.Text.Json that can't be pruned.
-         This is a false positive: https://github.com/NuGet/Home/issues/14103 -->
-    <NoWarn>$(NoWarn);NU1511</NoWarn>
   </PropertyGroup>
 
   <ItemGroup>
diff --git a/src/libraries/Microsoft.Extensions.DependencyInjection/tests/DI.Tests/Microsoft.Extensions.DependencyInjection.Tests.csproj b/src/libraries/Microsoft.Extensions.DependencyInjection/tests/DI.Tests/Microsoft.Extensions.DependencyInjection.Tests.csproj
index 647a4aa7c6bb9b..39e02df0a05ce1 100644
--- a/src/libraries/Microsoft.Extensions.DependencyInjection/tests/DI.Tests/Microsoft.Extensions.DependencyInjection.Tests.csproj
+++ b/src/libraries/Microsoft.Extensions.DependencyInjection/tests/DI.Tests/Microsoft.Extensions.DependencyInjection.Tests.csproj
@@ -4,6 +4,8 @@
     <TargetFrameworks>$(NetCoreAppCurrent);$(NetFrameworkCurrent)</TargetFrameworks>
     <EnableDefaultItems>true</EnableDefaultItems>
     <IncludeRemoteExecutor>true</IncludeRemoteExecutor>
+    <!-- This test library intentionally references an inbox P2P as it needs the implementation, instead of the contract.
+         Suppress the NU1511 warning in the whole project as putting it on a P2P doesn't work: https://github.com/NuGet/Home/issues/14121 -->
     <NoWarn>$(NoWarn);NU1511</NoWarn>
     <!-- CS0436: DynamicallyAccessedMemberTypes conflicts with imported type -->
     <NoWarn Condition="$([MSBuild]::GetTargetFrameworkIdentifier('$(TargetFramework)')) == '.NETFramework'">$(NoWarn);CS0436</NoWarn>
diff --git a/src/libraries/Microsoft.Extensions.Hosting.Abstractions/tests/Microsoft.Extensions.Hosting.Abstractions.Tests.csproj b/src/libraries/Microsoft.Extensions.Hosting.Abstractions/tests/Microsoft.Extensions.Hosting.Abstractions.Tests.csproj
index 86468f5456b163..6dad632fa33888 100644
--- a/src/libraries/Microsoft.Extensions.Hosting.Abstractions/tests/Microsoft.Extensions.Hosting.Abstractions.Tests.csproj
+++ b/src/libraries/Microsoft.Extensions.Hosting.Abstractions/tests/Microsoft.Extensions.Hosting.Abstractions.Tests.csproj
@@ -3,7 +3,8 @@
   <PropertyGroup>
     <TargetFrameworks>$(NetCoreAppCurrent);$(NetFrameworkCurrent)</TargetFrameworks>
     <EnableDefaultItems>true</EnableDefaultItems>
-    <!-- Suppress the NU1511 warning in the whole project as putting it on a P2P doesn't work: https://github.com/NuGet/Home/issues/14121 -->
+    <!-- This test library intentionally references an inbox P2P as it needs the implementation, instead of the contract.
+         Suppress the NU1511 warning in the whole project as putting it on a P2P doesn't work: https://github.com/NuGet/Home/issues/14121 -->
     <NoWarn>$(NoWarn);NU1511</NoWarn>
   </PropertyGroup>
 
diff --git a/src/libraries/Microsoft.Extensions.Logging/tests/Common/Microsoft.Extensions.Logging.Tests.csproj b/src/libraries/Microsoft.Extensions.Logging/tests/Common/Microsoft.Extensions.Logging.Tests.csproj
index fbd4bfeda5a158..2d7a3ba89ad650 100644
--- a/src/libraries/Microsoft.Extensions.Logging/tests/Common/Microsoft.Extensions.Logging.Tests.csproj
+++ b/src/libraries/Microsoft.Extensions.Logging/tests/Common/Microsoft.Extensions.Logging.Tests.csproj
@@ -3,6 +3,8 @@
   <PropertyGroup>
     <TargetFrameworks>$(NetCoreAppCurrent)-windows;$(NetCoreAppCurrent);$(NetFrameworkCurrent)</TargetFrameworks>
     <EnableDefaultItems>true</EnableDefaultItems>
+    <!-- This test library intentionally references an inbox P2P as it needs the implementation, instead of the contract.
+         Suppress the NU1511 warning in the whole project as putting it on a P2P doesn't work: https://github.com/NuGet/Home/issues/14121 -->
     <NoWarn>$(NoWarn);NU1511</NoWarn>
   </PropertyGroup>
 
diff --git a/src/libraries/System.Diagnostics.DiagnosticSource/tests/MetricOuterLoopTests/MetricOuterLoop.Tests.csproj b/src/libraries/System.Diagnostics.DiagnosticSource/tests/MetricOuterLoopTests/MetricOuterLoop.Tests.csproj
index 428a2d9bc39145..6a6d0c6e33f629 100644
--- a/src/libraries/System.Diagnostics.DiagnosticSource/tests/MetricOuterLoopTests/MetricOuterLoop.Tests.csproj
+++ b/src/libraries/System.Diagnostics.DiagnosticSource/tests/MetricOuterLoopTests/MetricOuterLoop.Tests.csproj
@@ -3,7 +3,6 @@
   <PropertyGroup>
     <TargetFrameworks>$(NetCoreAppCurrent);$(NetCoreAppCurrent)-browser;$(NetFrameworkCurrent)</TargetFrameworks>
     <IncludeRemoteExecutor>true</IncludeRemoteExecutor>
-    <NoWarn>NU1511</NoWarn>
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(TargetOS)' == 'browser'">
@@ -24,7 +23,7 @@
     <Compile Include="MetricEventSourceTests.cs" />
   </ItemGroup>
 
-  <ItemGroup>
+  <ItemGroup Condition="'$(TargetFrameworkIdentifier)' == '.NETFramework'">
     <ProjectReference Include="..\..\src\System.Diagnostics.DiagnosticSource.csproj" />
   </ItemGroup>
 
diff --git a/src/libraries/System.Diagnostics.DiagnosticSource/tests/MetricOuterLoopTests/MetricOuterLoop1.Tests.csproj b/src/libraries/System.Diagnostics.DiagnosticSource/tests/MetricOuterLoopTests/MetricOuterLoop1.Tests.csproj
index 6f55c5c3b27dcc..fb606513ff3d46 100644
--- a/src/libraries/System.Diagnostics.DiagnosticSource/tests/MetricOuterLoopTests/MetricOuterLoop1.Tests.csproj
+++ b/src/libraries/System.Diagnostics.DiagnosticSource/tests/MetricOuterLoopTests/MetricOuterLoop1.Tests.csproj
@@ -3,7 +3,6 @@
   <PropertyGroup>
     <TargetFrameworks>$(NetCoreAppCurrent);$(NetCoreAppCurrent)-browser;$(NetFrameworkCurrent)</TargetFrameworks>
     <IncludeRemoteExecutor>true</IncludeRemoteExecutor>
-    <NoWarn>NU1511</NoWarn>
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(TargetOS)' == 'browser'">
@@ -24,7 +23,7 @@
     <Compile Include="MetricEventSourceTests1.cs" />
   </ItemGroup>
 
-  <ItemGroup>
+  <ItemGroup Condition="'$(TargetFrameworkIdentifier)' == '.NETFramework'">
     <ProjectReference Include="..\..\src\System.Diagnostics.DiagnosticSource.csproj" />
   </ItemGroup>
 
diff --git a/src/libraries/System.Diagnostics.DiagnosticSource/tests/System.Diagnostics.DiagnosticSource.Tests.csproj b/src/libraries/System.Diagnostics.DiagnosticSource/tests/System.Diagnostics.DiagnosticSource.Tests.csproj
index 6aaa4ad2e062aa..4f926615e50999 100644
--- a/src/libraries/System.Diagnostics.DiagnosticSource/tests/System.Diagnostics.DiagnosticSource.Tests.csproj
+++ b/src/libraries/System.Diagnostics.DiagnosticSource/tests/System.Diagnostics.DiagnosticSource.Tests.csproj
@@ -4,7 +4,6 @@
     <TargetFrameworks>$(NetCoreAppCurrent);$(NetCoreAppCurrent)-browser;$(NetFrameworkCurrent)</TargetFrameworks>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <IncludeRemoteExecutor>true</IncludeRemoteExecutor>
-    <NoWarn>NU1511</NoWarn>
     <EventSourceSupport Condition="'$(TestNativeAot)' == 'true'">true</EventSourceSupport>
     <!-- https://github.com/dotnet/runtime/issues/126862 -->
     <EnableTrimAnalyzer>false</EnableTrimAnalyzer>
@@ -71,7 +70,7 @@
     <Compile Include="$(CommonTestPath)System\Net\Configuration.Http.cs" Link="Common\System\Net\Configuration.Http.cs" />
   </ItemGroup>
 
-  <ItemGroup>
+  <ItemGroup Condition="'$(TargetFrameworkIdentifier)' == '.NETFramework'">
     <ProjectReference Include="..\src\System.Diagnostics.DiagnosticSource.csproj" />
   </ItemGroup>
 
diff --git a/src/libraries/System.Text.Json/tests/System.Text.Json.SourceGeneration.Tests/System.Text.Json.SourceGeneration.Tests.targets b/src/libraries/System.Text.Json/tests/System.Text.Json.SourceGeneration.Tests/System.Text.Json.SourceGeneration.Tests.targets
index 2233ab2704d2e9..8d054c1b691b56 100644
--- a/src/libraries/System.Text.Json/tests/System.Text.Json.SourceGeneration.Tests/System.Text.Json.SourceGeneration.Tests.targets
+++ b/src/libraries/System.Text.Json/tests/System.Text.Json.SourceGeneration.Tests/System.Text.Json.SourceGeneration.Tests.targets
@@ -17,9 +17,6 @@
     <!-- SYSLIB1226: Suppress JsonIgnoreCondition.Always on type warning (tested explicitly) -->
     <NoWarn>$(NoWarn);SYSLIB0020;SYSLIB0049;SYSLIB1030;SYSLIB1034;SYSLIB1037;SYSLIB1038;SYSLIB1039;SYSLIB1220;SYSLIB1223;SYSLIB1225;SYSLIB1226</NoWarn>
     <IgnoreForCI Condition="'$(TargetsMobile)' == 'true' or '$(TargetsLinuxBionic)' == 'true' or '$(TargetArchitecture)' == 'ARMv6'">true</IgnoreForCI>
-    <!-- NuGet warns about a transitive P2P to System.Text.Json that can't be pruned.
-         This is a false positive: https://github.com/NuGet/Home/issues/14103 -->
-    <NoWarn>$(NoWarn);NU1511</NoWarn>
   </PropertyGroup>
 
   <PropertyGroup>
@@ -161,7 +158,8 @@
   </ItemGroup>
 
   <ItemGroup Condition="'$(TargetFrameworkIdentifier)' == '.NETFramework'">
-    <ProjectReference Include="..\..\src\System.Text.Json.csproj" />
+    <ProjectReference Include="$(LibrariesProjectRoot)Microsoft.Extensions.Primitives\src\Microsoft.Extensions.Primitives.csproj" />
+    <ProjectReference Include="$(LibrariesProjectRoot)System.Text.Json\src\System.Text.Json.csproj" />
     <ProjectReference Include="$(LibrariesProjectRoot)System.Collections.Immutable\src\System.Collections.Immutable.csproj" />
     <ProjectReference Include="$(LibrariesProjectRoot)System.Linq.AsyncEnumerable\src\System.Linq.AsyncEnumerable.csproj" />
     <Reference Include="System.ComponentModel.DataAnnotations" />
@@ -180,7 +178,6 @@
 
   <ItemGroup>
     <DefaultReferenceExclusion Include="System.Text.Json.SourceGeneration" />
-    <ProjectReference Include="$(LibrariesProjectRoot)Microsoft.Extensions.Primitives\src\Microsoft.Extensions.Primitives.csproj" />
   </ItemGroup>
 
   <Target Name="FixIncrementalCoreCompileWithAnalyzers" BeforeTargets="CoreCompile">
diff --git a/src/libraries/System.Threading.AccessControl/tests/System.Threading.AccessControl.Tests.csproj b/src/libraries/System.Threading.AccessControl/tests/System.Threading.AccessControl.Tests.csproj
index ff674a45771a0e..6973eb5eb35448 100644
--- a/src/libraries/System.Threading.AccessControl/tests/System.Threading.AccessControl.Tests.csproj
+++ b/src/libraries/System.Threading.AccessControl/tests/System.Threading.AccessControl.Tests.csproj
@@ -2,9 +2,6 @@
 
   <PropertyGroup>
     <TargetFrameworks>$(NetCoreAppCurrent)-windows;$(NetFrameworkCurrent)</TargetFrameworks>
-    <!-- This test library intentionally references inbox P2Ps as it needs the implementation, instead of the contract.
-         Suppress the NU1511 warning in the whole project as putting it on a P2P doesn't work: https://github.com/NuGet/Home/issues/14121 -->
-    <NoWarn>$(NoWarn);NU1511</NoWarn>
   </PropertyGroup>
 
   <ItemGroup>
@@ -20,7 +17,7 @@
     <Compile Include="ThreadingAclExtensionsTests.cs" />
   </ItemGroup>
 
-  <ItemGroup>
+  <ItemGroup Condition="'$(TargetFrameworkIdentifier)' == '.NETFramework'">
     <ProjectReference Include="..\src\System.Threading.AccessControl.csproj" />
   </ItemGroup>