After 5 weeks of having the stupid zoom.
Click your emoji on top left
Then the settings wheel on top right
Scroll to very bottom
Click clear lens cache
This thread isn't solved. The only resolution that I have found, is open your camera. Right on the front of the camera window, when its facing you, there is a icon you can slide. The icon is a image of 1 person, or multiple persons. Slide it to multiple people. That pans the camera further back , unzooming. Close the camera and open snapchat. It's now fixed and working correctly.