In the verse of the gradual for the Seventeenth Sunday after Pentecost, there is a quilisma preceded by a doubled note at the beginning of the word omnis. According to the rules of the Solesmes method, the ictus falls at the beginning of the doubled note, therefore the note immediately preceding the quilisma does not call for a repercussion/rearticulation.

I examined the modern notation edition of the Liber as well as the accompaniments by Bragers and Potiron, all of which normally mark the note preceding the quilisma with a horizontal episema, but it is lacking in this case in all three of those books. Is there no lengthening of the note before the quilisma here? I am aware that the Vatican and Solesmes editions do not correspond to oldest manuscripts. The question is specifically about whether this and similar instances (if any) are addressed in the Solesmes method.