It seems that the long text was
shortened in MT during one of the compositional stages of the song. At that
time part of the verse was removed in an act of theological censorship. The
added elements in 4QDeutq and the LXX were deleted in MT when the
phrase “sons of God” was considered an undesirable polytheistic depiction of
the world of the divine. Tendentious changes are never consistent, and hence
similar polytheistic depictions remained elsewhere without harming the
Israelite religion . . . Thus, the scribe responsible for this act of
censorship was not active in the other passages. (Emanuel Tov, Textual
Criticism of the Hebrew Bible [4th ed.; Minneapolis, Minn.:
Fortress Press, 2022], 249)