I cannot speak for S&T, but my experience is that the worldwide postal services have never really recovered from the COVID disruptions. Until a year ago, when I was living in Australia, the BAA Journal took at least 2 months, and Christmas cards were still arriving in April.
That sounds about par for the course in the southern hemisphere. When a friend of mine moved back to South Africa, Christmas and birthday cards always arrived long after the relevant date. It would have been quicker to tie them to a passing swallow.