On node insert I want to save another node with data taken from first node into other Drupal database. The node in second site has 3 fields: title, image field, is_public.
Both Drupal installation shares same files directories.

Code:

    $file = file_load($image['fid']);
    unset($file->fid);
    $file->uid = 1;
    file_save($file);
    $image['fid'] = $file->fid;
    $node = new stdClass;
    $node->type = GALLERY_IMAGE_TYPE;
    node_object_prepare($node);
    $node->is_new = True;
    $node->language = LANGUAGE_NONE;
    $node->title = $file->filename;
    $node->uid = 1;
    $node->status = 1;
    $node->{GALLERY_IMAGE_PUBLIC_FIELD_NAME}[LANGUAGE_NONE][]['value'] = $is_public;
    node_save($node);
    db_set_active();

$node structure before node_save is similar to node structure created from admin panel and dump on hook_node_view:

Dump from hook_node_view in second database:

    [field_file_image] => Array
        (
            [und] => Array
                (
                    [0] => Array
                        (
                            [fid] => 9
                            [display] => 1
                            [description] => 
                            [upload_button] => Upload
                            [remove_button] => Remove
                            [upload] => 
                            [width] => 415
                            [height] => 332
                            [alt] => 
                            [title] => 
                        )

                )

        )

    [field_file_image_is_public] => Array
        (
            [und] => Array
                (
                    [0] => Array
                        (
                            [value] => 1
                        )

                )

        )


Node structure before node_save:

        stdClass Object
        (
            [type] => image
            [status] => 1
            [promote] => 1
            [sticky] => 0
            [uid] => 1
            [created] => 1355514057
            [revision] => 
            [comment] => 2
            [menu] => Array
                (
                    [link_title] => 
                    [mlid] => 0
                    [plid] => 0
                    [menu_name] => main-menu
                    [weight] => 0
                    [options] => Array
                        (
                        )
        
                    [module] => menu
                    [expanded] => 0
                    [hidden] => 0
                    [has_children] => 0
                    [customized] => 0
                    [parent_depth_limit] => 8
                )
        
            [language] => und
            [title] => wyoming-rocky-mountains.jpg
            [field_file_image] => Array
                (
                    [und] => Array
                        (
                            [0] => Array
                                (
                                    [fid] => 13
                                    [display] => 1
                                    [description] => 
                                    [upload_button] => Upload
                                    [remove_button] => Remove
                                    [upload] => 
                                    [width] => 415
                                    [height] => 332
                                    [alt] => 
                                    [title] => 
                                )
        
                        )
        
                )
        
            [field_file_image_is_public] => Array
                (
                    [und] => Array
                        (
                            [0] => Array
                                (
                                    [value] => 1
                                )
        
                        )
        
                )
        
        )
    
    
    $node structure after node_save:
    
    
    stdClass Object
    (
        [vid] => 13
        [uid] => 1
        [title] => wyoming-rocky-mountains.jpg
        [log] => 
        [status] => 1
        [comment] => 2
        [promote] => 1
        [sticky] => 0
        [nid] => 13
        [type] => image
        [language] => und
        [created] => 1355514057
        [changed] => 1355514057
        [tnid] => 0
        [translate] => 0
        [revision_timestamp] => 1355514057
        [revision_uid] => 1
        [rdf_mapping] => Array
            (
                [rdftype] => Array
                    (
                        [0] => sioc:Item
                        [1] => foaf:Document
                    )
    
                [title] => Array
                    (
                        [predicates] => Array
                            (
                                [0] => dc:title
                            )
    
                    )
    
                [created] => Array
                    (
                        [predicates] => Array
                            (
                                [0] => dc:date
                                [1] => dc:created
                            )
    
                        [datatype] => xsd:dateTime
                        [callback] => date_iso8601
                    )
    
                [changed] => Array
                    (
                        [predicates] => Array
                            (
                                [0] => dc:modified
                            )
    
                        [datatype] => xsd:dateTime
                        [callback] => date_iso8601
                    )
    
                [body] => Array
                    (
                        [predicates] => Array
                            (
                                [0] => content:encoded
                            )
    
                    )
    
                [uid] => Array
                    (
                        [predicates] => Array
                            (
                                [0] => sioc:has_creator
                            )
    
                        [type] => rel
                    )
    
                [name] => Array
                    (
                        [predicates] => Array
                            (
                                [0] => foaf:name
                            )
    
                    )
    
                [comment_count] => Array
                    (
                        [predicates] => Array
                            (
                                [0] => sioc:num_replies
                            )
    
                        [datatype] => xsd:integer
                    )
    
                [last_activity] => Array
                    (
                        [predicates] => Array
                            (
                                [0] => sioc:last_activity_date
                            )
    
                        [datatype] => xsd:dateTime
                        [callback] => date_iso8601
                    )
    
            )
    
        [cid] => 0
        [last_comment_timestamp] => 1355514057
        [last_comment_name] => 
        [last_comment_uid] => 1
        [comment_count] => 0
        [name] => admin
        [picture] => 0
        [data] => b:0;
    )

I don't understand why custom fields are wipeout.