The bug
Customized World Settings are non-responsive after you reset the settings back to default. You can make them responsive again if you press "Randomize".
Comments

Customized World Settings are non-responsive after you reset the settings back to default. You can make them responsive again if you press "Randomize".
migrated
(Unassigned)
Confirmed
Minecraft 18w01a
Retrieved
Resolving as invalid as everything is now covered in MC-123800.