When did USPS start using San Antonio as distribution center for Houston?

I’ve always seen my packages hit the north Houston distribution center before finally making their way to me. But the last 3 packages I bought are all sitting and sitting and sitting in the San Antonio distribution center.

Is that new?

I did move from Pearland to magnolia so do us people more North have our stuff go through San Antonio? Or is this trying to ease some of the burden of the Houston distribution center?