About this blogger:
A theorist, organist, and conductor, Jeff Ostrowski holds his B.M. in Music Theory from the University of Kansas (2004), and did graduate work in Musicology. He serves as choirmaster for the new FSSP parish in Los Angeles, where he resides with his wife and children.
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“The main place should be given, all things being equal, to gregorian chant, as being proper to the roman Liturgy. Other kinds of sacred music, in particular polyphony, are in no way excluded, provided that they correspond to the spirit of the liturgical action and that they foster the participation of all the faithful.”
— 2011 GIRM, §41 (Roman Missal, 3rd Edition)
Editio Vaticana Errata
published 7 November 2010 by Jeff Ostrowski

As great as the Editio Vaticana is, it is not perfect in every detail.

Joseph Gogniat points out that the Vatican Edition sometimes fails to mark each liquescent:

Here is another instance where liquescents are missing:

N.B. This example was taken from Cantus Selecti, which is not (strictly speaking) part of the Vatican Edition.