I have an odd issue and trouble tracking it down.

OPC 2.1.4
Zen Cart 1.5.6c

The order confirmation emails for guest checkout have the billing and shipping address as a single line of text (https://prnt.sc/tczh24). Regular account order confirmation emails appear correctly with each line of the address on it's own line.

I'm having trouble tracking down where this issue might be coming from. I've been tracking down $email_text in /includes/classes/observers/class.checkout_one_observer.php
but not having any luck solving this.