UITextfield One Time Code persisting across all fields

Hi

I am setting the textContentType of a single field in my UI.

self.activationCodeField.textContentType = .oneTimeCode

I now find that any textfield throughout the entire app that uses numberPad keyboard type is being suggested the code received via SMS, tested on iOS 14.5 devices.

First of all I am not sure why any other field should be affected by the setting on this single textfield, bet even when I set the type on other fields to .none, the code is still suggested.

anotherTextField.textContentType = .none

Any ideas?
Thanks