Looks like a Big Old Fan Leaf to me..If it's at the top of the plant(newer leaves) its a sulfur deficiency. At the bottom, on older leaves, its a magnesium deficiency. Looks like sulfur. A pic of the whole plant is better for diagnosis.
Yeah, I see. That first pic looks like the node just below a shoot though. Idk, you could be right. Pic of the plant would put it to rest.Looks like a Big Old Fan Leaf to me..
Sulfur is a rare one to find in coco. Epsom fixes both.I've started noticing slight yellow veins in my bigger Fan leaves.