Not to be rude but this isn’t about books which are in Catholic Bibles. Though they were put in an appendix to the Latin Vulgate following the Council of Trent, they do not have Canonical status in the Catholic Church, though they do to some extent in Orthodox Churches. They are 1 and 2 Esdras, (however in the Latin Vulgate they are 3 and 4 Esdras as Ezra and Nehemiah are 1 and 2 Esdras), and the Prayer of Mannaseh. These are in an appendix to traditional Latin Vulgates and original DR Bibles before the Challanor revision.
All three do have a past in the Church, just so happens while Trent reaffirmed most of the Deuterocanonical Books, these three texts were actually not affirmed as Canon. Prior to that though they were present in the Old Testament, Prayer of Mannaseh right after Chronicles, and 3 and 4 Esdras after 1 and 2 (Ezra and Nehemiah).
So with that in mind it isn’t that crazy that these texts do make a liturgical mark. It just came as a surprise.