Game feature plugins load config files in a different way than normal plugins, which is confusing and can lead to broken behavior unless the developer knows about these issues ahead of time. The loading path for override config files named "PluginNameGame.ini" may need to be special cased, but the loading process for "PluginName.ini" should work the same as normal plugins. Game feature plugins are different because they use LoadExternalIniFile and bypass the config hierarchy so the files are loaded as if they were from the saved folder. This causes two issues:
This issue is somewhat similar to [Link Removed], which was a related issue where engine and game plugins loaded from different config files
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-163425 in the post.