ACP2E-3063: [Cloud] Cache is not getting invalidated.

- without test

Author: arnobsh

app/code/Magento/Cms/Model/TagsStrategy.php

@@ -22,7 +22,8 @@ public function getTags($object)
         return [
             sprintf('%s_%s', Page::CACHE_TAG, $object->getId()),
             sprintf(
-                '%s_%s', 'CMS_PAGE_VIEW_ID',
+                '%s_%s',
+                'CMS_PAGE_VIEW_ID',
                 str_replace('-', '_', strtoupper($object->getIdentifier()))
             )
         ];

app/code/Magento/Cms/Observer/InvalidateLayoutCacheObserver.php

@@ -18,6 +18,7 @@
 
 namespace Magento\Cms\Observer;
 
+use Magento\Cms\Model\Page;
 use Magento\Framework\App\Cache\Type\Layout as LayoutCache;
 use Magento\Framework\App\Cache\StateInterface as CacheState;
 use Magento\Framework\App\Cache\Tag\Resolver;
@@ -74,6 +75,10 @@ public function execute(Observer $observer)
             return;
         }
 
+        if (!$object->dataHasChangedFor(Page::PAGE_LAYOUT)) {
+            return;
+        }
+
         if (!$this->cacheState->isEnabled(LayoutCache::TYPE_IDENTIFIER)) {
             return;
         }