我构建了一个简单的插件，它有一个CPT和一个metabox部分，可以从管理员那里收集额外的信息。它在旧版本中运行良好，但当我刚刚将其更新到WordPress 5时，它停止了工作。

我试着弄清楚，当我对元框输入字段进行注释时，我的CPT工作正常。否则，我会出现以下错误。

检测到post类型不匹配。

如果我错过了什么，我在网上找不到任何帮助。

以下是我的metabox代码：

// add_action(\'add_meta_boxes\', array($this, \'answer_meta_action\'));
add_action(\'admin_menu\', array($this, \'answer_meta_action\'));

public function answer_meta_action() {
    add_meta_box( 
        \'ttl-to-edit\', 
        __(\'Edit In Response To\', \'ttl-p\'), 
        array($this, \'response_to_edit\'), 
        \'ttl\', // Custom Post Type 
        \'normal\', 
        \'high\'
    );
}

public function response_to_edit()
{
    $post_types = get_post_types();
    ?>
    <style>.clearfix {overflow: auto;}.clearfix::after {content: "";clear: both;display: table;}</style>
    <span class="tsqa_response_to_action-error" style="color:#ff0000;"></span>
    <div id="tsqa_response_to_action">
        <div style="margin: 10px 0 10px 0;" class="clearfix">
            <div class="box-section" style="width:250px;float:left;">
                <strong><label>Post Type:</label></strong> <br>
                <select name="post_type" style="width: 200px;margin-right:20px;">
                    <option value="">- Select -</option>
                    <?php foreach( $post_types as $post_type ): ?>
                        <option value="<?php echo $post_type ?>"><?php echo $post_type ?></option>
                    <?php endforeach; ?>
                </select>
            </div>
        </div>
    </div>
    <?php
}

CPT Register:

add_action(\'init\', array($this, \'init\'));
public function init() {


    $labels = array(
        \'name\' => _x( \'Question\', \'Post Type General Name\', \'\' ),
        ....
    );



    $args = array(
        \'labels\'             => $labels,
        \'description\'        => __( \'Questions\', \'\' ),
        \'public\'             => false,
        \'publicly_queryable\' => false,
        \'show_ui\'            => true,
        \'show_in_menu\'       => true,
        \'menu_position\'      => 5,
        \'menu_icon\'          => \'dashicons-format-status\',
        \'query_var\'          => true,
        \'rewrite\'            => array(\'slug\'=>\'question\'),
        \'capability_type\'    => \'post\',
        \'capabilities\'       => array(
            \'create_posts\'       => \'do_not_allow\', 
        ), 
        \'map_meta_cap\'       => true,
        \'has_archive\'        => \'questions\',
        \'hierarchical\'       => false,
        \'menu_position\'      => null,
        \'supports\'           => array( \'title\', \'editor\' ), 
    );


    register_post_type( \'ttl\', $args );
    flush_rewrite_rules();
}