How to convert Protection Books back to Mending, etc after MC-130489

Had the MC-130489 Enchanted books problem. Latest saved game went from 18w21b to 18w22a, then 18w22c - books in chest, village converted to Protection. Converted to 1.13Pre1, no change, books still protection. Had a 1.12 game world, converted to 1.13pre1, no problem. Had earlier version of my 18w21b world, converted, no problem. So, problem only with world that had already been converted to 18w22c, causing Protection bug. Is there a way to convert the bugged Protection books back, or am I stuck?