I was going around my word when I found a pillar of sugarcane that was 4 blocks tall
The X Y Z is -611 63 57 and the seed is 1501207056
MC-174893
Sugarcane generates to 4 blocks tall
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I am pretty sure that this is an intentional feature. In the Minecraft wiki, it says that there is a 1 in 9 chance for sugarcane to generate 4 blocks tall.