diff -u b/core/modules/block/lib/Drupal/block/BlockAccessController.php b/core/modules/block/lib/Drupal/block/BlockAccessController.php
--- b/core/modules/block/lib/Drupal/block/BlockAccessController.php
+++ b/core/modules/block/lib/Drupal/block/BlockAccessController.php
@@ -20,80 +20,72 @@
    * {@inheritdoc}
    */
   protected function checkAccess(EntityInterface $entity, $operation, $langcode, User $account) {
-    if ($operation === 'view') {
-      // @todo \Drupal\Core\Entity\EntityAccessController::viewAccess() casts to a
-      //   Boolean, which incorrectly implies that access was always explicitly
-      //   granted or denied. To work around this call
-      //   \Drupal\Core\Entity\EntityAccessController::access() directly and check
-      //   the return type.
-      $access = $this->access($entity, 'view', $langcode, $account);
-      if ($access !== FALSE) {
-        // If entity access did not explicitly deny access, consult the plugin.
-        if ($entity->getPlugin()->access()) {
-          // Otherwise, check for other access restrictions.
-          global $user;
-
-          // User role access handling.
-          // If a block has no roles associated, it is displayed for every role.
-          // For blocks with roles associated, if none of the user's roles matches
-          // the settings from this block, access is denied.
-          $visibility = $entity->get('visibility');
-          if (!empty($visibility['role']['roles']) && !array_intersect(array_filter($visibility['role']['roles']), array_keys($user->roles))) {
-            // No match.
-            return FALSE;
-          }
-
-          // Page path handling.
-          // Limited visibility blocks must list at least one page.
-          if (!empty($visibility['path']['visibility']) && $visibility['path']['visibility'] == BLOCK_VISIBILITY_LISTED && empty($visibility['path']['pages'])) {
-            return FALSE;
-          }
-
-          // Match path if necessary.
-          if (!empty($visibility['path']['pages'])) {
-            // Assume there are no matches until one is found.
-            $page_match = FALSE;
-
-            // Convert path to lowercase. This allows comparison of the same path
-            // with different case. Ex: /Page, /page, /PAGE.
-            $pages = drupal_strtolower($visibility['path']['pages']);
-            if ($visibility['path']['visibility'] < BLOCK_VISIBILITY_PHP) {
-              // Compare the lowercase path alias (if any) and internal path.
-              $path = current_path();
-              $path_alias = drupal_strtolower(drupal_container()->get('path.alias_manager')->getPathAlias($path));
-              $page_match = drupal_match_path($path_alias, $pages) || (($path != $path_alias) && drupal_match_path($path, $pages));
-              // When $block->visibility has a value of 0
-              // (BLOCK_VISIBILITY_NOTLISTED), the block is displayed on all pages
-              // except those listed in $block->pages. When set to 1
-              // (BLOCK_VISIBILITY_LISTED), it is displayed only on those pages
-              // listed in $block->pages.
-              $page_match = !($visibility['path']['visibility'] xor $page_match);
-            }
-            elseif (module_exists('php')) {
-              $page_match = php_eval($visibility['path']['pages']);
-            }
-
-            // If there are page visibility restrictions and this page does not
-            // match, deny access.
-            if (!$page_match) {
-              return FALSE;
-            }
-          }
-
-          // Language visibility settings.
-          if (!empty($visibility['language']['langcodes']) && array_filter($visibility['language']['langcodes'])) {
-            if (empty($visibility['language']['langcodes'][language($visibility['language']['language_type'])->langcode])) {
-              return FALSE;
-            }
-          }
-          return TRUE;
-        }
-        else {
-          return FALSE;
-        }
+    // Currently, only view access is implemented.
+    if ($operation != 'view') {
+      return FALSE;
+    }
+    // If the plugin denies access, then deny access.
+    if (!$entity->getPlugin()->access()) {
+      return FALSE;
+    }
+
+    // Otherwise, check for other access restrictions.
+    global $user;
+
+    // User role access handling.
+    // If a block has no roles associated, it is displayed for every role.
+    // For blocks with roles associated, if none of the user's roles matches
+    // the settings from this block, access is denied.
+    $visibility = $entity->get('visibility');
+    if (!empty($visibility['role']['roles']) && !array_intersect(array_filter($visibility['role']['roles']), array_keys($user->roles))) {
+      // No match.
+      return FALSE;
+    }
+
+    // Page path handling.
+    // Limited visibility blocks must list at least one page.
+    if (!empty($visibility['path']['visibility']) && $visibility['path']['visibility'] == BLOCK_VISIBILITY_LISTED && empty($visibility['path']['pages'])) {
+      return FALSE;
+    }
+
+    // Match path if necessary.
+    if (!empty($visibility['path']['pages'])) {
+      // Assume there are no matches until one is found.
+      $page_match = FALSE;
+
+      // Convert path to lowercase. This allows comparison of the same path
+      // with different case. Ex: /Page, /page, /PAGE.
+      $pages = drupal_strtolower($visibility['path']['pages']);
+      if ($visibility['path']['visibility'] < BLOCK_VISIBILITY_PHP) {
+        // Compare the lowercase path alias (if any) and internal path.
+        $path = current_path();
+        $path_alias = drupal_strtolower(drupal_container()->get('path.alias_manager')->getPathAlias($path));
+        $page_match = drupal_match_path($path_alias, $pages) || (($path != $path_alias) && drupal_match_path($path, $pages));
+        // When $block->visibility has a value of 0
+        // (BLOCK_VISIBILITY_NOTLISTED), the block is displayed on all pages
+        // except those listed in $block->pages. When set to 1
+        // (BLOCK_VISIBILITY_LISTED), it is displayed only on those pages
+        // listed in $block->pages.
+        $page_match = !($visibility['path']['visibility'] xor $page_match);
+      }
+      elseif (module_exists('php')) {
+        $page_match = php_eval($visibility['path']['pages']);
+      }
+
+      // If there are page visibility restrictions and this page does not
+      // match, deny access.
+      if (!$page_match) {
+        return FALSE;
+      }
+    }
+
+    // Language visibility settings.
+    if (!empty($visibility['language']['langcodes']) && array_filter($visibility['language']['langcodes'])) {
+      if (empty($visibility['language']['langcodes'][language($visibility['language']['language_type'])->langcode])) {
+        return FALSE;
       }
-      return $access;
     }
+    return TRUE;
   }
 
 }