When set to true, this will allow you to create subdivisions inside of each other.
By default they will not inherit the permissions of the parent subdivision, unlike un-nested subdivisions; you will need to /trust players manually to nested subclaims.
Fixed a weird quirk where trusted parent players were not listed in the /trustlist of subclaims.
You will now have to use /3dsubdivideclaim command to activate the 3D Subdivisions mode. 1-layer high 3D subdivisions are now possible via the /3dsubdivideclaim command.