FOSS gamedev and creative worlds

* How can you reproduce the bug?

Simply plant a sapling and watch it grow

* What is your operating system?

Ubuntu 13.04

* What is your version of Minetest?

0.4.7-dev daily build from minetest PPA

* What game do you use? (e.g. minetest_game, MiniTest, dwarves)

It's occuring in a modless minetest_game

This is a known bug that was introduced recently. It will be fixed soon; keep in touch :)