Packaging a DLC Plugin Fails with "Couldn't Update Resources" Error

Attempting to package a plugin as DLC is failing with the following error message:

However, in 4.16 Main CL# 3345045 the same process actually seems to cause a commandlet crash, which is shown in the attached ProjectLauncher_MAIN.log file attached to this ticket.

1. Add the attached launch profiles to your <EngineInstallLocation>\Engine\Programs\UnrealFrontend\Profiles
2. Create a new C++ project
3. Save the map as NewMap
4. Open the project launcher
5. Edit the FULLGAME profile
6. The only changes you need to make are to check NewMap under Cooked Maps and update the Local Directory Path to package to.
7. Launch FULLGAME
8. When it finishes, navigate to Edit->Plugins and create a new, blank plugin named TestPlugin
9. Restart the editor and rebuild the .dll when prompted
10. Open the project launcher
11. Edit the DLCTEST profile and check NewMap under Cooked Maps and update the Local Directory Path to package to.
12. Launch DLCTEST

Result: Packaging fails with error:

Expected: Packaging would complete successfully

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