Large cocoa pod top texture is only 7 pixels wide, while the sides are 8 pixels wide. The cocoa pod doesn't also have a consistent texture consistency. It varies from the sides of the pod to the top/bottom of the pod.
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Steps on how to reproduce:
1.Equip; cocoa beans, bonemeal and jungle logs, place 2 jungle logs down vertically and then plant some cocoa beans on the side of the already place down jungle logs.
2.Bonemeal the cocoa pod until it grows to a large cocoa pod. (Max size and looks brownish).
3.Count the pixels of the cocoa pod's horizontal and vertical sides.
Can confirm for MC 1.12.1.