Leaves occasionally drop sticks, but looking up recipes for sticks doesn't display this information anywhere. This change occurred in Minecraft 1.14.

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JEI's purpose is to show recipes (crafting, smelting, stonecutting, etc.), not item/block/mob drops. Unless I'm wrong ;)

A recipe is where items come from and where items go to. Evidence? Hit R on a Concrete Block. It is impossible to make one unless you put concrete powder next to water, yet this is documented. That's not a crafting recipe, a smelting recipe, or anything to do with stonecutting, banner making, or composting.

Base JEI does not document creating concrete from concrete powder. That might be from an add-on mod of some sort.

I would say it’s Just Enough Resources