Bug - [T3D Beta 1.1B] - Forest data doesn't save the first time

I haven't tested this thoroughly but it's happened twice now. I added a new forest item and start planting trees, saving every so often. The first time I spent only an hour or so working on it then saved and exited. The next time I went in to the level the trees were all gone!
A few days passed (just enough time for me to forget about the first debacle) and I was working on a second level and created a new forest and spent several hours planting and saving. Then switched levels and when I came back all of the trees were gone again!

If I get time I'll test again.