iCloud passwords
iCloud Keychain is turned on but passwords are not there
iPhone 11 Pro Max, iOS 15
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See the article Automatically fill in strong passwords on iPhone - Apple Support
Prevent iPhone from automatically filling in passwords
Go to Settings > Passwords > AutoFill Passwords, then turn off AutoFill Passwords.
Note : you had to turn in Autofill passwords , so that further passwords that are about to be saved will save .