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One doesn't contradict the other.
These bugs have been described in the physics engine for quite some time. How extensive is your knowledge of the game's mechanics beyond the physics engine?
I've been studying the game at the software code level for quite some time (a couple of years), and I'm writing my own code. Before that, I just played the game, practically since its release. If we're talking about the physics engine, I periodically communicate with the author of the physics engine and provide him with various new insights about the game's inner workings.