An odd gender-swap:
#Nehemiah 6:14 (MT) lists Nehemiah's opponents Toviyah and Sanballat, as well as an otherwise unattested "prophetess No`adyah."
In OG, Pesh, and Vulg No`adyah is a (male) prophet. The difference is one letter (הַנְּבִיאָה֙ vs. הנביא).
Did MT uniquely add a letter to make an opposing prophet female? Or did all of the other versions drop the letter in favor of the more common masculine form, making her male?