iPhone 16 Pro Max camera blackout for UPI apps and scan code after 18.4 update

After 18.4 update my iphone 16 pro max camera is blackout in all the upi apps and including scan code which is in build feature of apple . It's really frustrating to have this bug . Restarting the phone resolves the issue but for every two three days we can't be checking the restart . So kindly provide solution

[Re-Titled by Moderator]

Original Title: Camera for scanning in all the upi apps and scan code is freezing