No, it’s always been that way. Since Prime is now abolished in the OF liturgy, it is either said after Lauds, a minor hour or stand alone.
I’m guessing it’s to ensure everyone was aware of the next day’s liturgy in a era when there was no internet and before that, no printing press.
This is for liturgical proclamation of course, in chapter.
Our abbey does the martyrology outside the liturgy; it is proclaimed at the noon meal by the refectory reader, and is always for the following day.