I was trying out if my 4x4 piston door still works with the Redstone Experimens feature enabled. It does, but it is a bit spazzy. Which is a shame because this door is designed to be fast. After a full breakdown of the circuit, I discovered this bug is the cause of the spazziness of my door.

How to reproduce:

1. Create and open a world with the Redstone Experiments feature enabled
2. Build the circuit shown on the picture.
3. Right click the lever on, and then off after a second

What shoud happen: As you flick the lever off, the redstone dust gets 1 pulse, then a constant power
What does happen: The redstone dust gets 2 pulses, and then gets BUD-powered in it's off state (as shown on the picture).