This mod is a request of my daughters, some old worlds are crufted by unknown nodes because I disabled some mods in the meantime. The code is based on "antifire" mod, but with logic to try to restore the landscape by placing similar to nearly existing nodes, not just remove the unknown nodes.

No warranty, please take a backup before you try to "restore" your old worlds,How to use: 1) get the "unknownburn:flint" from creative inventory, 2) use it on unknown nodes, 3) wait
License: LGPL-2.1
Mod dependencies: none
Code+Download: https://github.com/bell07/minetest-unknownburn