Repro:
- Go to zhwiki.
- Disable input tools (the green button in ULS).
- Apply settings.
- Reload page.
- Now the tool appears disabled.
- Enable input tools (the green button).
- Choose "中文".
- Apply settings.
- Reload page.
- The tool still appears disabled.
- This doesn't happen when "English" is chosen in step 7.
See Also:
T54666: Languages lacking input methods should not appear when selecting an input method