My minecraft level.dat wont show the mapfeatures tag

[riccieriii]

I want to change it from 0 to 1 but it wont show on the file
Playing ftb oceanblock and started the world with generate structures false, but want to change it to true

[rebane2001]

Add a new byte value then lol, this does not seem like an issue with NBTExplorer itself.

[riccieriii]

and how do I do that? sorry, im just trying to fix my problem

[aco90]

I have the exact same problem and could not find a sollution on the interwebs... any advice here please?