Bonemeal is being used on ready plants for some reason.
Which Wurst version/MC version?
I could only reproduce this without losing bonemeal with the "other" setting on in Wurst 1.17.1.
Are you sure you don't have "other" enabled in the BonemealAura settings?
Also are you actually losing bonemeal or does it only looks like it's trying to place bonemeal?
it's placing bonemeal onto full growth wheat. it wasted bonemeal and also makes wheat go at the first stage of growth. 1.17.1