Anyways there is a host of seforim supporting it, and from the Arugas H'bosem we see it's not that recent for sure.
It is traced back a couple hundred years, I think the Radvaz is the first.
Of course there are many seforim supporting it.
I think it’s noteworthy that it wasn’t a thing until a couple of hundred years ago, and it’s very clear it was a thing in other cultures. I do not know for certain. It is not my minhag though my wife insists on it (and we wonder how it spreads) but I reserve the right to consider the possibility that it isn’t כולו קודש.