6 files declare their use of AccessibleInterface in Zircon Profile 8

EntityAccessControlHandlerTest.php in core/modules/system/src/Tests/Entity/EntityAccessControlHandlerTest.php

Contains \Drupal\system\Tests\Entity\EntityAccessControlHandlerTest.

EntityInterface.php in core/lib/Drupal/Core/Entity/EntityInterface.php

Contains \Drupal\Core\Entity\EntityInterface.

FieldItemListInterface.php in core/lib/Drupal/Core/Field/FieldItemListInterface.php

Contains \Drupal\Core\Field\FieldItemListInterface.

NodeSearch.php in core/modules/node/src/Plugin/Search/NodeSearch.php

Contains \Drupal\node\Plugin\Search\NodeSearch.

SearchPageAccessControlHandler.php in core/modules/search/src/SearchPageAccessControlHandler.php

Contains \Drupal\search\SearchPageAccessControlHandler.

UserSearch.php in core/modules/user/src/Plugin/Search/UserSearch.php

Contains \Drupal\user\Plugin\Search\UserSearch.