默认情况下the_post_navigation() 使用当前的帖子类型，无论它是什么。幸运的是，该函数最终调用get_adjacent_post() 有几个钩子我们可以用。以下使用get_{$adjacent}_post_where 哪里$adjacent 是“或”；“上一页”；或“或”；下一步：

/**
 * Modify the posts navigation WHERE clause
 * to include our acceptable post types
 * 
 * @param String $where - Generated WHERE SQL Clause
 * 
 * @return String
 */
function wpse375885_postnav_where( $where ) {
    
    global $wpdb, $post;
    
    // Return Early
    if( empty( $post ) ) {
        return $where;
    }
    
    $search = sprintf( "p.post_type = \'%s\'", $post->post_type );
    
    // Return Early - $where already modified
    if( false == strpos( $where, $search ) ) {
        return $where;
    }
    
    // Almost all non-builtin in post types
    $acceptable_post_types = array_merge(
        array( 
            \'post\',
            \'page\'
        ),
        get_post_types( array( 
            \'_builtin\' => false
        ) )
    );
    
    $placeholders   = array_fill( 0, count( $post_types ), \'%s\' );
    $format         = implode( \',\', $placeholders );
    
    $replace = $wpdb->prepare( 
        "p.post_type IN ($format)",
        $post_types
    );
    
    return str_replace( $search, $replace, $where );
    
}
add_filter( \'get_next_post_where\',      \'wpse375885_postnav_where\' );
add_filter( \'get_previous_post_where\',  \'wpse375885_postnav_where\' );

就我个人而言，我会取代$acceptable_post_types 使用我已知的帖子类型数组，以防止将来安装的插件被添加到列表中
您也可以更改\'_builtin\' => true 真正引入所有岗位类型。