Bug 1:
It doesn't transfer Email Forwarders. The section Email Forwarders on new CWP server is totally blank for domain moved over.
Bug 2:
DNS, if @ or MX records pointing to external (other than CWP) it disregards the external IP's, and still points to new local server.
The challenge is that if old CWP has IP ie, 1.2.3.4 and new CWP has ie. 4.3.2.1, the @ should of course change from new to old. However, if a customer is using external IP such as 5.5.5.5, it still changes it to 4.3.2.1. That will be a disaster, if not noticing.
Bug 3:
Contacts in webmail (RoundCube) not copied over to new server.
Bug 4:
Addon domains located inside /public_html/addon-domain throws an error when accessing via web browser.
Forbidden
You don't have permission to access this resource. Server unable to read htaccess file, denying access to be safe