Glaring Omission from Post-Vatican II Lectionary
In the 1980s, Father Valentine wrote to a Vatican Congregation in Rome about this omission. It still hasn’t been fixed.
Pope Saint Paul VI (3 April 1969): “Although the text of the Roman Gradual—at least that which concerns the singing—has not been changed, the Entrance antiphons and Communions antiphons have been revised for Masses without singing.”