gistfile1.txt

add_filter( 'houzez_property_feed_update_postarr', 'retain_existing_data', 10, 4 );
function retain_existing_data( $my_post, $property, $import_id, $post_id ) {
    // Get the existing post object
    $existing_post = get_post( $post_id );

    if ( $existing_post ) {
        // Preserve existing values
        $my_post['post_title']   = $existing_post->post_title;
        $my_post['post_excerpt'] = $existing_post->post_excerpt;
        $my_post['post_content'] = $existing_post->post_content;
    }

    return $my_post;
}