I solved the problem.
Recently, I migrated the iOS with all apps from my old iPhone 8 to the new iPhone 12 Pro and was wondering about a lot of bugs in COD mobile. I can‘t use the shoot button and move the optics in the same moment, so multi touch was not working.
the solution was the easiest way: I backed up my COD account online, deleted the app and installed a new fresh COD mobile from the App Store. Problem solved!
I think the reason of the problem was COD itself: On the old iPhone 8, COD was set up on the 3D touch settings. For information: 3D Touch is da hardware feature in the display, that has only the iPhone 8 and NOT the iPhone 12! So 3D touch isn‘t running on iPhone 12, because it has no 3D houch hardware. I think, this creates the bug in the COD installation.
On the iPhone 12, we have to use the manual focus now. A few tries and it‘s easy as well.
Because a lot of user misunderstood the 3D Touch Feature:
Haptic Touch IS NOT like 3D Touch!
Haptic Touch is a long press (captured in time) that activates the Taptic Engine (Vibration) for interactions. This is not for gaming. You have to use the manual shooting mode in COD.
3D Touch is a sensitive sensor in the iPhone 8 (hardware) behind the screen, that scans the intensity of the pressure without time delay. The iPhone 12 has no 3D Touch Hardware!