На странице модуля : https://www.drupal.org/project/easy_breadcrumb
написано:

Important: There is no extra, duplicate block for breadcrumbs. The system breadcrumb block is simply extended and improved. So, just place the system breadcrumb block in block UI and the breadcrumbs work.

Т.е. он "расширяет" и улучшает стандартный блок drupal 8: Breadcrumbs