Language override - "Use system language setting" not work after choosed another language

[dzl333]

(There is only one language in my system Region & Language settings.)

1. In app Settings - Layout - Language override, choose a language that is different from the system default language. Restart app.
2. Back to Language override, and choose "Use system language setting". Restart app.
3. The application is now still displayed in the language you selected in step 1. But not in system default language.