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Could be that you're standing a bit away from the middle. Either way this doesn't happen to me and I only use one account. Not to mention that I...
No? One player covers a 3x3 chunk around them so you only need 1 afker to stand in the middle of the plot to update the plot... As I said before.
Players update a 3x3 chunk area around the player. A whole plot is about 2.5x2.5 chunks so a player standing in the middle will for an examsple...
I'm not personally sure about the exact chance. I believe it's a percentage chance to get it from a level 100 enchant. It took me about 15-20...