metabox html not updating after publish

I have added a simple metabox with a checkbox that corresponds to a meta field.
I have verified with xdebug that after posting, the metabox callback is called and returns the updated html, but for some reason it doesn’t update in the editor.

function cabtv_add_post_options()
{
	// Add our meta box for the "post" post type (default)
	if ( current_user_can("send_notifications") ) {
		$post_types = ["post", "go_live"];
		foreach ($post_types  as $post_type) {
			add_meta_box(
				'cabtv_notif_on_post',
				'Notifications',
				'cabtv_notif_on_post_html_view',
				$post_type,
				'side',
				'high'
			);
		}
	}
}
add_action('admin_init', 'cabtv_add_post_options');

function cabtv_notif_on_post_html_view($post)
{
	//wp_nonce_field( 'cabtv_notif_metabox', 'cabtv_notif_metabox' );
	$checked = cabtv_should_post_send_notification($post);
	
	if ( get_post_meta( $post->ID, 'cabtv_notifications_sent', true ) == "1" ) { ?>
		<div style='padding:10px;'><span style='color:red; font-weight:bold;'>Notifications have already been sent for this post.</span></div>
	<?php } ?>

	<input type="hidden" name="cabtv_meta_box_present" value="true"></input>
	<input type="checkbox" name="cabtv_send_notification" value="true" <?php if ($checked) echo 'checked'; ?>></input>
	<label>
	<?php echo esc_attr('Send notification on '.($post->post_status === 'publish' ? 'update' : 'publish') ); ?>
	</label>
<?php
}

Any ideas?

• This topic was modified 4 years, 9 months ago by hedgehog90.