post_submitbox_misc_actions不适用于wordpress v5.5

如何解决post_submitbox_misc_actions不适用于wordpress v5.5

我试图在wordress的帖子/页面后端的“文档”下创建按钮 在wp v5.5之前，它可以工作，但是现在不显示这些按钮。不确定确切的问题

add_action( 'post_submitBox_misc_actions','my_post_submitBox_misc_actions',10,1);

function my_post_submitBox_misc_actions($post){
    ?>
    <div class="misc-pub-section misc-pub-section-last my-options">
        <label for="my_custom_post_action">My Option</label><br />
        <select id="my_custom_post_action" name="my_custom_post_action">
            <option value="1">First Option goes here</option>
            <option value="2">Second Option goes here</option>
        </select>
    </div>
    <?PHP
}