Relates to:
The bug
When you press the "Defaults" button in the customized world generation settings, a message appears asking you if you are sure about this. At the same time all GUI elements in the background are being disabled (probably to prevent MC-24390 from happening). If you however resize the game all buttons will be enabled.
How to reproduce
Open the customized world generation settings
Change a value
Click on the "Defaults" button
Resize the game
→ All buttons are enabled again
Related issues
Comments


Why not?

Because MC-258 is a general bug which affects text fields, while this seems to happen only for these buttons and not for all

Meh, reopened.

Is this still an issue in the most recent versions (currently that is 1.10.2, or 16w42a) of Minecraft? If so, please update the affected versions and help us keeping this ticket updated from time to time.
Can confirm for Minecraft 1.12.1.
This relates to, but not duplicates MC-258 in my opinion