worldgen minecart w/ chests have enchanted books without storedenchant tag

I found an enchanted book in an minecart with a chest in a mineshaft. The book didn't show what the enchant is, and i couldn't combine it with any item. If someone wants to check it out and confirm it, here is the seed and the coordinates. Seed is (2291471084820984796), and coordinates are X: 976, Y: 12, Z: -140 . Cheers.