Why doesn't China Customs open tourist visas?

Why doesn't China Customs open tourist visas? The tourist visa has come down and the plane ticket has been bought, so you can't get out of customs by plane. Because they don't have to travel, they are basically persuaded to go back to the customs. Maybe it's the epidemic! You are not traveling, you still need a visa. Tourist visas will not be issued by China Customs, so it doesn't matter if you don't leave according to the date of visa application in the travel itinerary, but the customs will issue them.