Rabbi Poliakoff in his book “Minhagei Lita” mentions this minhag and relates that in Lita (or at least in Telz where he learned for many years) this practice was unheard of.
In truth, it is a befeirush Mechaber AND Rama, Orach Chaim 25:2.
I know many who practice it. Why don’t we all?
I know the answer but I am not allowed to tell.