Issue happens in 1.2.1.1 not 1.2.0.81

If you running while trying to place a block it is so super fast you'll always place thousands of them (for example in creative mode)

Reproduce:
Move while...

• Opening a door
• Placing blocks
• Using redstone mechanics like Levers

... or just interact with something

Expectation:

• Doors (trap, "normals", fencegates etc.) would open or close just once per click
• Just placing one block per click
• Lever state will change to "true" or "false" once per click

PS: WHY you releasing this unpolished update so fast? Please never do this again...
PPS: Awaiting shaders to hopefully get away with that weird new lightning stuff you pushed (but that's an other issue)