Metadata language: total chaos

Does Infuse actually retain the edited metadata language once it’s been changed? I’ve dedicated months to individually updating hundreds of non-English titles to Chinese, Japanese, or Korean metadata while leaving the default metadata language as English. However, today, most of those titles have reverted back to English metadata. It’s been an incredibly frustrating experience.

After years of requests, how difficult would it be to implement a metadata language option for each favorite?