Bug when loading an external project that also exists in the uprojectdirs

When launching the editor for the "external\foreign" project, the code in GetEngineAndProjectAbsoluteDirsFromExecutable ends up superseding the path returned from {{FPlatformMisc::ProjectDir() }} with the path of the "native" project:

This result in the error message in the PNG attached to this case. 

• Sync an engine stream and Lyra in the Samples
• Compile the Editor and run it once so it's registered
• Make a copy of Lyra in an external folder
• Associate the copy to the engine stream using UnrealVersionSelector
• Generate the solution, compile and run the external copy