Here we have another example where Oliver Cowdery omitted a word in his copying from 𝓞 to 𝓟. In this instance, he accidentally deleted the most that was right before precious. Elsewhere in the text, there are five other occurrences of “most precious” used predicatively in a relative clause, so there is obviously nothing wrong with its use here in 1 Nephi 11:9. In fact, two of these (like 1 Nephi 11:9) involve fruit:
For discussion of “most precious” in conjoined phrases, especially those involving the adjective plain, see 1 Nephi 13:28.
Summary: Restore the example of “most precious” in 1 Nephi 11:9; Oliver Cowdery accidentally dropped most when he copied from 𝓞 into 𝓟.