While trying out the new fishing mechanics, I got an enchantment book with both Bain of arthropods IV and feather falling IV. Normally you cannot get them on the same enchantment as one will be useful.
MC-31544
enchantment book bug while fishing
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Its an "either/or" enchantment. You apply it to either a weapon or armor and the appriperiate enchantment will go to it. Theres a twitter post from dinnerbone about it somewhere