Chocolate and honey (and the flowing variants) are tagged as water, causing them to be usable for recipes that require water.
More info here #mekanism/Mekanism/issues/7159

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This is supposedly intended, so that chocolate and honey act as water for the purposes of swimming and boats.

It still doesn't make much sense for those fluids to be tagged as they are, since they are not water. mekanism/Mekanism#7159 (comment)

they're tagged as water to allow for boats to be ridden on them and players to be able to swim through them. I do agree though, they should look into Pup's suggestion