ViveUSA issue explanation
My template lost it because of unavailability of this link. If you switch off the javascript, then you will see that an email is protected.See

And when I debug this part of the code, the only link I get is href="0"

So, there are no way to set this link except something link @set_attr(href, "mailto:", text()): //a[@href="0"].(also we can add contains(text(), "@") or even match this). But, we will match only this and similar cases. BUT the website can have just part of the email(like "Stevej...@gmail.com"), this link will be clickable and it will confuse users. Yes, it's so rare case, but this issue is also a rare case. And I cannot cover all the little things(I think it's minor because we don't lose any content)
In conclusion, we cannot identify this link just by href="0" and also, we don't lose any content because you can write this address yourself.