Bug 1: Standing on the Edge of a Foundation gives the Fatigue Bar
Sometimes when you stand on the edge of a foundation, it thinks your swimming and gives you the fatigue bar. I could see how going afk in this position accidentally could cause people to lose their game.
Bug 2: Can't chop down trees
Sometimes when chopping down trees, it doesn't give you the wood chopping effect or the items, and the tree doesn't fall down. I have found that even from approaching at different angles and on different trees, the bug persists. You just have to wait until you can again.