Isaiah 49:26 (King James Bible)
and they shall be drunken with their own blood as with sweet wine
Oliver Cowdery initially wrote wines, then later, in heavier ink, he crossed out the plural s. He probably did this without reference to a King James Bible since he was simply removing what was an obvious error. Nonetheless, this change does represent later editing of the text, which was perhaps done after 𝓞 had been copied into 𝓟. Of course, the obvious error was not copied into 𝓟.
When this verse is quoted a second time in 2 Nephi 6, the singular wine occurs—and without any correction:
Summary: Retain the current reading wine in 1 Nephi 21:26, which follows the King James reading and the corrected reading in 𝓞.