Clear WP Rocket Cache & WP Rocket Cloudflare automatically if the Frontpage doesn't display all the recent posts. Requires adjustments on per site basis, but, the idea is here, ensure the Cloudflare cache is reset properly.

file-in-wp-root.php

<?php

// Load WordPress.
require( 'wp-load.php' );

$site_url = get_site_url();
$latest_5_post_ids = get_posts([
  'posts_per_page' => 5,
  'paged'          => 1,
  'post_type'      => [ 'post' ],
  'fields'         => 'ids'
] );

$missing_post_ids = 0;
$site_content = wp_remote_get( $site_url, [
  'user-agent' => 'Internal Cache Monitoring Tool;',
] );

if( empty( $site_content ) )
  exit( '<p style="color:#e74c3c;">Cannot retrieve site content</p>' );

if( is_wp_error( $site_content ) )
  exit( '<p style="color:#e74c3c;">' . esc_html( $site_content->get_error_message() ) . '</p>' );

$site_content = wp_remote_retrieve_body( $site_content );

if( empty( $site_content ) )
  exit( '<p style="color:#e74c3c;">Cannot retrieve site content</p>' );

foreach( $latest_5_post_ids as $post_id )
  $missing_post_ids += ( strpos( $site_content, 'id="post-' . $post_id . '"' ) === false ? 1 : 0 );


if( $missing_post_ids === 0 )
  exit( '<p style="color:#3498db;">No reset required</p>' );

// Clear cache.
if ( function_exists( 'rocket_clean_domain' ) ) {
  rocket_clean_domain();
  echo '<p style="color:#3498db;">rocket_clean_domain - success</p>';
} else {
  echo '<p style="color:#e67e22;">rocket_clean_domain - failed</p>';
}

$options = get_option( 'wp_rocket_settings' );

// Would be great if WP Rocket realized the convenient function they had for this, is not working.
// And there's really no explanation on how to use their function, getting this standalone was more convenient.
if( $options[ 'do_cloudflare' ] === 1 ) {
  //Purge the entire cache via API
  $ch_purge = curl_init();
  curl_setopt($ch_purge, CURLOPT_URL, "https://api.cloudflare.com/client/v4/zones/". $options[ 'cloudflare_zone_id' ] ."/purge_cache");
  curl_setopt($ch_purge, CURLOPT_CUSTOMREQUEST, "DELETE");
  curl_setopt($ch_purge, CURLOPT_RETURNTRANSFER, 1);
  $headers = [
    'X-Auth-Email: '. $options[ 'cloudflare_email' ],
    'X-Auth-Key: '. $options[ 'cloudflare_api_key' ],
    'Content-Type: application/json'
  ];
  $data = json_encode([ "purge_everything" => true ] );
  curl_setopt($ch_purge, CURLOPT_POST, true );
  curl_setopt($ch_purge, CURLOPT_POSTFIELDS, $data );
  curl_setopt($ch_purge, CURLOPT_HTTPHEADER, $headers );

  $result = json_decode(curl_exec($ch_purge),true);
  curl_close($ch_purge);

  if( intval( $result['success'] ) == 1 )
    echo '<p style="color:#3498db;">purge_cloudflare - success</p>';
  else
    echo '<p style="color:#e67e22;">purge_cloudflare - error</p>';
} else {
  echo '<p style="color:#3498db;">purge_cloudflare - skipped</p>';
}

$missing_post_ids = 0;
$site_content = wp_remote_get( $site_url, [
  'user-agent' => 'Internal Cache Monitoring Tool;',
] );

if( empty( $site_content ) )
  exit( '<p style="color:#e74c3c;">Reset might have failed, check manually - check 1</p>' );

if( is_wp_error( $site_content ) )
  exit( '<p style="color:#e74c3c;">Reset might have failed, check manually - check 2</p>' );

$site_content = wp_remote_retrieve_body( $site_content );

foreach( $latest_5_post_ids as $post_id )
  $missing_post_ids += ( strpos( $site_content, 'id="post-' . $post_id . '"' ) === false ? 1 : 0 );

if( $missing_post_ids === 0 )
  exit( '<p style="color:#2ecc71;">Reset Success</p>' );
else
  exit( '<p style="color:#e74c3c;">Reset might have failed, check manually - check 3</p>' );