Marcus Röhner

Finally I uploaded some screenshots. First screen shows the view when you are inside the machine. The steps are now the following:
1. Place a sapling on the dirt block in front of the piston (picture 2).
2. Use bonemeal to grow the tree (picture 3).
3. U can activate the machine by flipping the lever. You see the logs of the tree form the tree gets pushed to the left from the pistons on the right. At the same time most of the leaves gets destroyed by the other pistons. Some of destroyed leaves drops now some saplings or apples (picture 4).

Before updating to the latest patch (having this issue since 1.4.4 pre) the dropped items rest inside the machine and only there.

Now with the recent patch you can find some of them outside the machine (picture 5 and 6).

I edited the description to answer your questions.

I can confirm that bug with pistons. Doesn't matter if they are sticky or not! The bug comes with the new 1.4.4 pre version. I encountered that while using my treefarm. When the leaves gets destroyed by the pistons there is the chance that the dropped sapling gets stuck into that piston. When the piston retracts that item wouldnt push to the right side. Thats why i can't collect all of the dropped saplings any more which would make my farm useless. You can easily reproduce that bug by building a piston wall and let them destry leaves. You will see that sometimes the dropped saplings behave weird.