Index: flexiaccess.admin.inc
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- flexiaccess.admin.inc	(date 1531485384000)
+++ flexiaccess.admin.inc	(date 1531775944000)
@@ -86,7 +86,6 @@
   }
 
   drupal_set_message(t('Flexi access changes have been updated.'));
-  cache_clear_all();
 }
 
 
Index: flexiaccess.module
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- flexiaccess.module	(date 1531485384000)
+++ flexiaccess.module	(date 1531775944000)
@@ -324,3 +324,30 @@
   }
   drupal_set_message("Deleted $num ACLs");
 }
+
+
+/**
+ * Forcibly clear the page cache for the given node
+ *
+ * The cache_page table contains separate records for the aliased and unaliased paths of a node.
+ * This removes both.
+ *
+ * @param $node \Drupal\node\Entity\Node
+ *    The node for which to clear the page cache.
+ *
+ * @return int
+ *    The number of records deleted from the cache_page table.
+ */
+function flexiaccess_force_clear_page_cache_for_node($node) {
+
+  $path = 'node/' . $node->nid;
+  $url = url($path);
+
+  $or = db_or();
+  $or->condition('cid', "%$path%", 'LIKE');
+  $or->condition('cid', "%$url%", 'LIKE');
+  $query = db_delete('cache_page')->condition($or);
+  $result = $query->execute();
+  return $result;
+
+}
Index: flexiaccess.nodes.inc
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- flexiaccess.nodes.inc	(date 1531485384000)
+++ flexiaccess.nodes.inc	(date 1531775944000)
@@ -55,7 +55,7 @@
         $acl_id = acl_get_id_by_name('flexiaccess', $op . '_' . $node->nid);
 
         $foo = acl_edit_form($form_state, $acl_id, t('Manage !op permission', array('!op' => $op)));
-	
+
         $form['acl'][$op] = acl_edit_form($form_state, $acl_id, t('!op permission', array('!op' => $op)));
         $form['acl'][$op]['#collapsed'] = !isset($_POST['acl_' . $acl_id]) && !unserialize($form['acl'][$op]['user_list']['#default_value']);
       }
@@ -94,13 +94,13 @@
     foreach (array('view', 'update', 'delete') as $op) {
       if (isset($form_state['values']['acl'][$op])) {
         acl_save_form($form_state['values']['acl'][$op]);
-      }	
+      }
     }
   }
 
   // Apply new settings.
   node_access_acquire_grants($node);
-  cache_clear_all();
+  flexiaccess_force_clear_page_cache_for_node($node);
 
   drupal_set_message(t('Your changes to the ACL has been saved.'));
 }
@@ -116,7 +116,7 @@
 
   // Apply new settings.
   node_access_acquire_grants($node, TRUE);
-  cache_clear_all();
+  flexiaccess_force_clear_page_cache_for_node($node);
 
   drupal_set_message(t('An ACL for the node has been created.'));
 }
@@ -132,7 +132,7 @@
 
   // Apply new settings.
   node_access_acquire_grants($node, TRUE);
-  cache_clear_all();
+  flexiaccess_force_clear_page_cache_for_node($node);
 
   drupal_set_message(t('The ACLs list for the node has been removed.'));
 }
Index: flexiaccess.users.inc
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- flexiaccess.users.inc	(date 1531485384000)
+++ flexiaccess.users.inc	(date 1531775944000)
@@ -209,10 +209,11 @@
     }
 
     // Apply changes for the node.
-    node_access_acquire_grants(node_load($ac['nid']));
+    $node = node_load($ac['nid']);
+    node_access_acquire_grants($node);
+    flexiaccess_force_clear_page_cache_for_node($node);
   }
 
-  cache_clear_all();
   drupal_set_message(t('Your changes to the ACL has been saved.'));
 }