custom_breadcrumbs.service.yml

services:
  custom_breadcrumbs.breadcrumbs:
    class: Drupal\custom_breadcrumbs\Breadcrumb\CustomBreadcrumbs
    tags:
      - { name: breadcrumb_builder, priority: 1015 }

CustomBreadcrumbBuilder.php

<?php

namespace Drupal\custom_breadcrumbs\Breadcrumb;

use Drupal\Core\Breadcrumb\BreadcrumbBuilderInterface;
use Drupal\Core\Routing\RouteMatchInterface;
use Drupal\Core\Breadcrumb\Breadcrumb;
use Drupal\Core\Link;
use Drupal\Core\Url;

class CustomBreadcrumbBuilder implements BreadcrumbBuilderInterface {

  /**
   * {@inheritdoc}
   */
  public function applies(RouteMatchInterface $route_match) {
    \Drupal::logger('custom_breadcrumbs')->debug(print_r($route_match->getRouteName(), TRUE));
    return $route_match->getRouteName() === 'entity.node.canonical';
  }

  /**
   * {@inheritdoc}
   */
  public function build(RouteMatchInterface $route_match) {
    $node = $route_match->getParameter('node');

    $breadcrumb = new Breadcrumb();
    $breadcrumb->addCacheContexts(["url"]);
    $breadcrumb->addCacheTags(["node:{$node->nid->value}"]);

    \Drupal::logger('custom_breadcrumbs')->debug(print_r($route_match->getRouteName(), TRUE));

    $breadcrumb->addLink(Link::createFromRoute('Home Sweet Home', '<front>'));
    $breadcrumb->addLink(Link::fromTextAndUrl($node->getTitle(), Url::fromRoute('entity.node.canonical', ['node' => $node->id()])));

    return $breadcrumb;
  }

}