Another attempt

build/RuntimeStore.targets

@@ -40,7 +40,7 @@
     <!-- Restore and pack-->
     <MSBuild Projects="$(MetapackageWorkDirectory)Microsoft.AspNetCore.All.csproj"
       Targets="Restore;Pack"
-      Properties="Configuration=$(Configuration)" />
+      Properties="Configuration=$(Configuration);AdditionalImports=$(GeneratedRestoreSourcesPropsPath)" />
 
     <!-- Copy to output directory -->
     <ItemGroup>

build/common.props

@@ -1,7 +1,6 @@
 <Project>
   <Import Project="..\version.props" />
   <Import Project="dependencies.props" />
-  <Import Project="$(IntermediateDir)sources.props" Condition="Exists('$(IntermediateDir)sources.props')" />
 
   <PropertyGroup>
     <Product>Microsoft ASP.NET Core</Product>

src/Microsoft.AspNetCore.All/Microsoft.AspNetCore.All.csproj

@@ -1,6 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <Import Project="..\..\build\common.props" />
+  <Import Project="$(AdditionalImports)" Condition="'$(AdditionalImports)'!=''" />
 
   <PropertyGroup>
     <IncludeBuildOutput>false</IncludeBuildOutput>