Give non-members or visitors access to posts/shortcodes/blocks for specific post ID's

pmpro-give-access-to-posts-override-membership-restriction.php

<?php
/**
 * Bypasses all content restriction for posts, pages, blocks and shortcodes that are on certain pages.
 * Tweak this code further for your needs.
 * To add this code to your site, please follow this guide - https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */

function my_pmpro_allowed_posts() {
	$open_post_ids = array( 118 ); // Add all the POST ID's that you want to bypass here.
	return $open_post_ids;
}

// Give access to the post if the visitor/non-member is trying to access a post that is in the list of allowed posts.
function my_pmpro_has_membership_access_filter( $hasaccess, $post, $user, $levels ) {
	// already has access.
	if ( $hasaccess ) {
		return $hasaccess;
	}
	// if the user has access, return true
	if ( in_array( $post->ID, my_pmpro_allowed_posts() ) ) {
		$hasaccess = true;
	}
	return $hasaccess;
}
add_filter( 'pmpro_has_membership_access_filter', 'my_pmpro_has_membership_access_filter', 10, 4 );

// Give the person a 'fake' level to bypass shortcode and block content as well.
function my_pmpro_has_membership_level( $haslevel, $user_id, $levels ) {
	global $post;
	
	// Already has a membership level, let's just bail.
	if ( $haslevel ) {
		return $haslevel;
	}

	if ( in_array( $post->ID, my_pmpro_allowed_posts() ) ) {
		$haslevel = true;
	}
	return $haslevel;
}
add_filter( 'pmpro_has_membership_level', 'my_pmpro_has_membership_level', 10, 3 );