Bug Ghost Field?

As I wrote on this thread
https://www.chronoengine.com/forums/posts/t109985/ghost-value
there is a problem with the Ghost field.
​
I used this value
{var:read_data4.Model1.image}
as source code I see the hidden field correctly filled,
[label for="image"]Photo[/label]
but when I submit the form the field is empty.
​
in debug the field is empty

[var] => Array                
                  (
                    [Nome] => Saverio
                    [Cognome] => Francesco
                    [image] =>                 
                   )

Is this a bug or is there a solution?