I use iOS text replacement macros to save entering my email address in full and when I do, hitting the next button doesn’t work until I remove characters and type it manually.
Details to reproduce:
Add your email address to the iOS text replacement screen and enjoy being able to enter your email address by just typing @@ or whatever shortcut you want <- pro tip
iOS v 12.1.4
iPhone 6s Plus
No screenshot fo the app as I have now registered but this is the setting I had in iOS