Caused by the fix of MC-132281.
The bug
You won't be able to modify / write in the writing box while customising a Superflat world's preset.
How to reproduce
Create New World
More World Options...
World type: Superflat
Click on the option "Customise"
Remove all the layers (optional)
Click on the option "Presets"
Try to modify / write in the writing box
Related issues
is duplicated by
Comments


Greg, couldn't you just go back to pre4? I'd say pre5 but then you'd have to deal with that annoying lag issue.
Can confirm, I really want this fixed because now I have to use an NBT editor to edit it.