Incompatible with recent search_api 8.x-1.35 release

I can confirm.

I got the same message:

[success] Finished performing updates.
PHP Fatal error: Declaration of Drupal\search_api_solr\Plugin\search_api\backend\SearchApiSolrBackend::__sleep() must be compatible with Drupal\search_api\Backend\BackendPluginBase::__sleep(): array in /var/www/html/web/modules/contrib/search_api_solr/src/Plugin/search_api/backend/SearchApiSolrBackend.php on line 5077

Fatal error: Declaration of Drupal\search_api_solr\Plugin\search_api\backend\SearchApiSolrBackend::__sleep() must be compatible with Drupal\search_api\Backend\BackendPluginBase::__sleep(): array in /var/www/html/web/modules/contrib/search_api_solr/src/Plugin/search_api/backend/SearchApiSolrBackend.php on line 5077
[warning] Drush command terminated abnormally.
Failed to run drush updb: exit status 1
albertho ~/Documents/uw-deohs-web [06-27] $ ddev drush ws
PHP Fatal error: Declaration of Drupal\search_api_solr\Plugin\search_api\backend\SearchApiSolrBackend::__sleep() must be compatible with Drupal\search_api\Backend\BackendPluginBase::__sleep(): array in /var/www/html/web/modules/contrib/search_api_solr/src/Plugin/search_api/backend/SearchApiSolrBackend.php on line 5077

Fatal error: Declaration of Drupal\search_api_solr\Plugin\search_api\backend\SearchApiSolrBackend::__sleep() must be compatible with Drupal\search_api\Backend\BackendPluginBase::__sleep(): array in /var/www/html/web/modules/contrib/search_api_solr/src/Plugin/search_api/backend/SearchApiSolrBackend.php on line 5077
[warning] Drush command terminated abnormally.
Failed to run drush ws: exit status 1
albertho ~/Documents/uw-deohs-web [06-27] $ ddev drush cr
PHP Fatal error: Declaration of Drupal\search_api_solr\Plugin\search_api\backend\SearchApiSolrBackend::__sleep() must be compatible with Drupal\search_api\Backend\BackendPluginBase::__sleep(): array in /var/www/html/web/modules/contrib/search_api_solr/src/Plugin/search_api/backend/SearchApiSolrBackend.php on line 5077

I am experiencing the same issue.

See the fix in Search API OpenSearch 🐛 Handle missing return type in __wakeup() Fixed

I attach a patch that fix this issue.

#7 works for me.

I think we need to add the return type also in __wakeup() like in 🐛 Handle missing return type in __wakeup() Fixed

It works for me without implementation __wakeup(), it doesn't seems necessary because the parent BackendPluginBase already implementing __wakeup method.

  /**
   * Implements the magic __wakeup() method.
   *
   * Reloads the server entity.
   */
  public function __wakeup(): void {
    parent::__wakeup();

    if ($this->serverId) {
      $this->server = Server::load($this->serverId);
      $this->serverId = NULL;
    }
  }

This is already committed on 📌 Add a return type hint to SearchApiElasticsearchBackend::__sleep() Fixed , I'll make a new release soon.