Ahh I see, I didn't realise that was a thing. Hmm that is unlucky thenThe quest states to get either the enchantment on vanilla tools or the modifier on tinker tools. I've seen the excavation enchanted book in JEI.
Due to the whole "you have to grind experience and level up the tool" mechanic, I decided to just forego tinker tools and just use vanilla ones with enchantments, it's much easier to just do book enchanting in 1.12.2 especially with astral sorcery enchanting, not to mention my valonite pickaxe at this point has experience boost III on it so getting enchantment levels is really quick.
I just feel like I've been unlucky so far.