Don't update title on subsequent updates

gistfile1.txt

add_filter( 'houzez_property_feed_xml_mapped_field_value', 'only_title_on_first_import', 10, 5 );
function only_title_on_first_import($content, $property, $field, $import_id, $post_id = '')
{
    if ( $field != 'post_title' )
    {
        return $content;
    }
    
    if ( empty($post_id))
    {
        return $content;
    }
    
    $post = get_post( $post_id );
    
    return $post->post_title;
}

add_filter( 'houzez_property_feed_xml_mapped_field_value', 'only_content_on_first_import', 10, 5 );
function only_content_on_first_import($content, $property, $field, $import_id, $post_id = '')
{
    if ( $field != 'post_content' )
    {
        return $content;
    }
    
    if ( empty($post_id))
    {
        return $content;
    }
    
    $post = get_post( $post_id );
    
    return $post->post_content;
}