Fix missed WordPress scheduled post by publishing it after it has been missed (PHP 7.1)

fix_missed_scheduled_posts.php

<?php
/**
 * Fix for missing scheduled post
 *
 * @param array $schedules Cron Schedules.
 *
 * @return array
 */
function lc_cron_schedules( array $schedules ) : array {
	$schedules['lc_publish_missed_scheduled_posts'] = [
		'interval' => ( 5 * MINUTE_IN_SECONDS ),
		'display' => 'Publish Missed Scheduled Posts',
	];
	return $schedules;
}
add_filter( 'cron_schedules', 'lc_cron_schedules' );

/**
 * Fix for missing scheduled post
 *
 * @return void
 */
function lc_setup_publish_missed_scheduled_posts() : void {
	if ( ! wp_next_scheduled( 'lc_cron_publish_missed_scheduled_posts' ) ) {
		wp_schedule_event( time(), 'lc_publish_missed_scheduled_posts', 'lc_cron_publish_missed_scheduled_posts' );
	}
}
add_action( 'wp', 'lc_setup_publish_missed_scheduled_posts' );

/**
 * Fix for missing scheduled post
 *
 * @return void
 */
function lc_publish_missed_scheduled_posts() : void {
	global $wpdb;
	$scheduled_post_ids = $wpdb->get_col(
		$wpdb->prepare( "SELECT ID FROM $wpdb->posts WHERE ( ( post_date > 0 && post_date <= %s ) ) AND post_status = 'future' LIMIT 0, 10", current_time( 'mysql' ) )
	);
	if ( ! count( $scheduled_post_ids ) ) {
		return;
	}

	foreach ( $scheduled_post_ids as $scheduled_post_id ) {
		if ( ! $scheduled_post_id ) {
			continue;
		}
		wp_publish_post( $scheduled_post_id );
	}
}
add_action( 'lc_cron_publish_missed_scheduled_posts', 'lc_publish_missed_scheduled_posts' );