Bonus chest's and cheats' buttons sometimes activate on Hardcore but they're infunctional

Steps to reproduce

1. Select "Create New World" in world selection screen.
2. Choose hardcore mode.
3. Click on "More World Options".
4. Change world wype to Customized and click "More Options..."
5. Change some settings.
6. Click "Done".
   You'll see cheats' and bonus chest's buttons look like functional. But these buttons are useless.