When you try to harvest bamboo, the bamboo stalk will not update correctly. The one bamboo stalk that you did harvest will take a few seconds to update itself, however it will not update the rest of the stalk. This is negated when you harvest the bottom stalk of bamboo. However, when you do this, the bamboo stalk will grow back instantly. This makes bamboo farms inefficient at the least, and non-functional at the worst.

This is how you recreate it:

1) Plant bamboo.

2) Hit the second lowest bamboo stalk; Wait for it to drop 1 Bamboo.

3) Look to see if the rest of the stalk has updated.

4) If the bamboo stalk has not updated, then the bug has just occurred.