Walking and crouch are a definite yes. Just today I feel to my death trying to put a block on the side of a very tall 1 block tower. On another note I was actually trying to flood the world which almost worked and was hilarious.
I was riding a mine cart and a herd of pigs got in my way. Frustrated, I killed them all. As I returned to my mine cart, I noticed a pig had glitched his way into my cart. It was a cart and pig fused together. I then began to toy with the helpless pig and push him up and down the tracks.
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