Probably not a bug. CentiLeo uses Focus Distance value from C4D native Camera object. This value can be changed by C4D native tools, animated and targeted if I am not mistaken.
On top of that this Focus Distance can be changed inside CentiLeo IPR window with [AF] button (auto-focus). But this [AF] change will not make the focus distance to follow some object in focus. To do this, Cinema tools can be used, Cinema's autofocus with picker button.