As explained under 2 Nephi 23:17, the original text has a number of instances where a nor-conjunct occurs parenthetically between a preceding positive conjunct and its following negative predicate, thus “one jot—nor tittle—should not pass away”. This usage has, for the most part, been removed from the standard text. Here in 3 Nephi 1:25, the nor was edited to or in the 1920 LDS edition and in the 1953 RLDS edition. The critical text will restore or maintain, as the case may be, the original usage in such passages.
Summary: Restore the original nor in 3 Nephi 1:25 (“one jot nor tittle”), the reading of both 𝓟 and the 1830 edition; this kind of usage is found elsewhere in the original text.