To expand on this… Part of what happens to the nectar inside the bee’s honey crop is the addition of various enzymes (IIRC invertase is one. I don’t recall any of the others) that modify the sugars and other compounds in the nectar.

So nectar goes in, nectar + enzymes comes out, then the result is dried until the moisture content is low enough (~18% is what I was told as a beekeeper. Who knows how the bees measure it…)