9-1-1 and 9-1-1: Lone Star will have "some" crossover this season

Variety

“The pandemic didn’t go away, so it’s still super complicated to make these shows,” says showrunner Tim Minear. “There will be some crossover action in the back half of this season. Don’t expect a giant crossover where all the characters from one show appear on the other show. But there will be some cross-pollination. They’re almost treats. I don’t know that they’re big events like the wildfire. I’m trying to keep the universes as cross-pollinated as I can without cheating.”