I have added a strings catalog to my project, and it populates and updates correctly. However, after adding a few "vary as plurals" edits, now the file only renders as a JSON in the editor. So, there's no UI to add languages, for example.
The strings catalog still works, and if I manually edit a string it will be compiled into the app, and if I edit a string in my app source, it will update in the JSON file. It's just that the strings catalog UI itself is hidden.
If I delete the Localizable file and re-add it, the UI returns. But then if I make my pluralization edits again, the UI disappears and it renders only as JSON. If I drag this xcstrings file into another project it will render with the correct UI, so it seems like a project setting.
Is there some setting to re-enable this?