Isaiah 50:5 (King James Bible)
the Lord GOD hath opened mine ear and I was not rebellious
Here the 1874 RLDS edition accidentally dropped the and of the earliest text (and the King James Bible). The Isaiah quotations characteristically have fewer connective and ’s than does the Book of Mormon text proper. Note, for instance, that the previous clause has no initial and (“the Lord God hath opened mine ear”). Thus it is not surprising that the relative lack of connective and ’s in the Isaiah quotations might lead typesetters to accidentally omit some of the nearby legitimate and ’s. The 1908 RLDS edition restored the and to the RLDS text.
Summary: Maintain the original and in 2 Nephi 7:5 (“and I was not rebellious”).