Hi Patrick,
Thank you for looking into this issue. I had set the Email field to “optional”, so we could continue testing PayPal transactions. That’s why you could not replicate the problem.
I have reset the Email field to “required”, so you will now be able to replicate the issue. We have confirmed the autocomplete problem with Safari in MacOS and iOS, Microsoft Edge in Windows 10, Android, etc.
I’ve uploaded an export of the form to Google Drive.