Use build and buildTransitive

Rx.NET/Source/src/System.Reactive/System.Reactive.csproj

@@ -81,10 +81,11 @@
 
 
   <ItemGroup>
-    <None Include="bin\$(Configuration)\netcoreapp3.0\*.xml" PackagePath="buildTransitive\netcoreapp3.0" Pack="true" />
-    <None Include="bin\$(Configuration)\netcoreapp3.0\*.dll" PackagePath="buildTransitive\netcoreapp3.0" Pack="true" />
+    <None Include="bin\$(Configuration)\netcoreapp3.0\*.xml" PackagePath="payload\netcoreapp3.0" Pack="true" />
+    <None Include="bin\$(Configuration)\netcoreapp3.0\*.dll" PackagePath="payload\netcoreapp3.0" Pack="true" />
     <None Include="build\_._" PackagePath="lib\netcoreapp3.0" Pack="true" />
     <None Include="build\System.Reactive.targets" PackagePath="buildTransitive\netcoreapp3.0" Pack="true" />
+    <None Include="build\System.Reactive.targets" PackagePath="build\netcoreapp3.0" Pack="true" />
   </ItemGroup>
   
 </Project>

Rx.NET/Source/src/System.Reactive/build/System.Reactive.targets

@@ -4,7 +4,7 @@
     <UseWindowsRxVersion Condition="'$(UseWindowsVersion)' == '' " >false</UseWindowsRxVersion>
   </PropertyGroup>
   <ItemGroup>
-    <Reference Condition="'$(UseWindowsRxVersion)' == 'true' "  Include="$(MSBuildThisFileDirectory)System.Reactive.dll" />
+    <Reference Condition="'$(UseWindowsRxVersion)' == 'true' "  Include="$(MSBuildThisFileDirectory)..\..\payload\netcoreapp3.0\System.Reactive.dll" />
     <Reference Condition="'$(UseWindowsRxVersion)' != 'true' "  Include="$(MSBuildThisFileDirectory)..\..\lib\netstandard2.0\System.Reactive.dll" />
   </ItemGroup>
 </Project>