Yes, it was TSA not passport control, at SFO T3 Precheck. We always stay together in line and I've never had an issue with TSA. (Once in a great while some passport control officer makes us process separately, but mostly not.)

We last traveled together a month ago, at the same airport and at the same TSA checkpoint. As you might imagine, I'm no fan of "rules" that appear and disappear out of nowhere.