Issue #3176561 by beram: drupal_block does not use the plugin cache metadata

src/TwigExtension.php

@@ -501,6 +501,7 @@ class TwigExtension extends AbstractExtension {
 
     CacheableMetadata::createFromRenderArray($build)
       ->merge(CacheableMetadata::createFromObject($access))
+      ->merge(CacheableMetadata::createFromObject($block_plugin))
       ->applyTo($build);
 
     return $build;