Sticky Piston Glitch in 16w35a

I have a world and a sticky piston opening a hole, and it runs on a wood button and an inverter circuit. If I hold down the right click button, continuously pushing the wood button, I can see that the block doesn't move at one point. Eventually it returns to normal.

Reproduce
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1. Make the circuit described
2. Constantly hit the button
3. Observe
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I forced a crash, attached log file, and attached world file! (You have to put world files into folder to work; see the readme)