Spanish to English Other Food & Drink

I'm translating a text about Guatemalan coffee beans, which says that the raw beans are 'con hendidura en forma sisada'. The 'hendidura' is the fissure down the middle of the coffee bean, known in coffee circles as the 'centre cut', but I can't figure out 'en forma sisada'.

The dictionary definitions of 'sisar' (to pilfer, cheat, or to 'take in' clothing) don't fit at all. I also wondered if it meant 'S-shaped', which the centre cut of a coffee bean is often described as being, but can find nothing to back that up.

I also found this in a dictionary of americanismos (https://www.asale.org/damer/sisado), so wondered if they meant that the centre cut resembled a line of cement between two rows of bricks in a wall, but this seems a bit of a stretch.

Has anyone seen this or a similar usage of the word before? I wondered if perhaps it was a Guatemalan or Latin American colloquialism. Any help would be greatly appreciated!