Bug enforcing limits on self-chosen username?

Hello,

When using the option of Full Joomla User in the User Creation of JFBConnect, it appears the limit on the username (such as max length) as set through the CB Field manager are not enforced. I have a 12 char limit set there which is enforced when trying to register users using CB Login (and the Joomla backend). However, I can enter usernames with more then 12 chars when using JFBConnect. It would be great to bring this to the registering user's attention and have him choose a username that fits with the limitations. Is this a known issue or something I am doing wrong somewhere?

Thank you,
Oliver

PS I haven't actually tested if a similar issue holds for choosing the password. If it does, then it would be nice if JFBConnect enforced the CB limitations on that as well.