Bug cbcorefieldsajax

I have a Textfield with CB Core Field Ajax enabled.
When I check the triggers that get executed I see the onAfterUserUpdate trigger which is:

$_PLUGINS->trigger( 'onAfterUserUpdate', array( &$user, &$user, $oldUserComplete ) );

According to Krileon here: www.joomlapolis.com/forum/153-professional-member-support/225910-auto-action-trigger-on-value-change#246839 the $oldUserComplete should contain the old user object whil $user would containt the new one.

Unless I am doing something wrong, it does not.

In my case examining $user->myfield is contains the exact same value like $oldUserComplete->myfield which is the new value after updating the field with Ajax.

Where do I get the old value from to compare it against the new value?

BTW:

For trigger $_PLUGINS->trigger( 'onBeforeUserUpdate', array( &$user, &$user, &$oldUserComplete, &$oldUserComplete ) ); it works as expected. $user returns the current field, $oldUserComplete the old field.