.NET SDK 5.0.100-rc.2.20473.8

1. Include a native library in a .NET project's output:

   <ItemGroup>
     <None Include="...">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </None>
   </ItemGroup>

2. Add a P/Invoke:

   static void Main(string[] args)
   {
       NativeLib.HelloWorld();
   }
   
   [DllImport("NativeLib")]
   private static extern void HelloWorld();

3. Publish as single file: dotnet publish -p:PublishSingleFile=true ...
   • with different combinations of --self-contained and IncludeNativeLibrariesForSelfExtract
4. Depending on publish configuration, application fails with DllNotFoundException
   • --self-contained true -p:IncludeNativeLibrariesForSelfExtract=false (default)
     • Linux: fails
     • Windows: works - directory with the single-file executable ends up on native search path because the native runtime bits are there
   • --self-contained false -p:IncludeNativeLibrariesForSelfExtract=false
     • Linux: fails
     • Windows: works - default library load logic will look next to the running executable
   • --self-contained true -p:IncludeNativeLibrariesForSelfExtract=true
     • Linux: fails
     • Windows: works - extraction directory ends up on native search path because the native runtime bits are extracted there
   • --self-contained false -p:IncludeNativeLibrariesForSelfExtract=true
     • Linux: fails
     • Windows: fails

This works with 3.1 single-file.
Setting IncludeAllContentForSelfExtract=true (with the fix in #42435) works.

cc @vitek-karas