Are you sure? On a mobile device, it's easy to overlook pressing the enter key. Unfortunately, I can't do it much differently because, as far as I know, you can't reliably detect when the on-screen keyboard is closed.
Update: Now there should be an Enter key instead of the Next key.
So I deleted site cookies and data. No change.
So I emptied browser cache and retried. Now the button label is Done and press works as expected.