In the latest preview version, the rarity of books has been changed from "common" to "uncommon", and the rarity of enchanted books has been changed from "uncommon" to "common", which I think is unreasonable. In fact, enchanted books are rarer than books. And these two changes are not mentioned in the change log.
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migrated
Duplicate of MCPE-184806 & MCPE-184791
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