Are you sure your plugins are actually up to date (as in, the versions displayed in the console display correctly). You may have them installed, but they havent been refreshed internally.Hm, I updated all my plugins (just Gen 8 was one update out of date), and it's still doing the same thing.
I installed all of the same plugins in my project to a separate Pokemon Essentials folder, and it works, so I don't think it's related to my other plugins, but I'm not sure what would be causing it then.