One more thing that I’ve just figured out…
The plugin settings in your “Project Settings” window are not used when packaging the project.
“Default” settings are. (have a look at DefaultEngine.ini and DefaultEditor.ini at the project root)
Then, you must put your plugin settings to the default settings. (click the “Set as Default” button)
See the answer in this post for details:
https://answers.unrealengine.com/questions/28239/potential-bug-packaging-settings.html