diff --git a/core/lib/Drupal/Core/Render/Element.php b/core/lib/Drupal/Core/Render/Element.php
index 75c3ab74017..dbd0804119a 100644
--- a/core/lib/Drupal/Core/Render/Element.php
+++ b/core/lib/Drupal/Core/Render/Element.php
@@ -187,8 +187,8 @@ class Element {
   /**
    * Indicates whether the given element is empty.
    *
-   * An element that only has #cache set is considered empty, because it will
-   * render to the empty string.
+   * An element that only has #cache, #weight, or #attached set is considered
+   * empty, because it will render to the empty string.
    *
    * @param array $elements
    *   The element.
@@ -197,7 +197,7 @@ class Element {
    *   Whether the given element is empty.
    */
   public static function isEmpty(array $elements) {
-    return empty($elements) || (count($elements) === 1 && array_keys($elements) === ['#cache']);
+    return \array_diff(\array_keys($elements), ['#cache', '#weight', '#attached']) === [];
   }
 
 }
diff --git a/core/tests/Drupal/Tests/Core/Render/ElementTest.php b/core/tests/Drupal/Tests/Core/Render/ElementTest.php
index 1c795c7dba0..b847e672af2 100644
--- a/core/tests/Drupal/Tests/Core/Render/ElementTest.php
+++ b/core/tests/Drupal/Tests/Core/Render/ElementTest.php
@@ -188,6 +188,29 @@ class ElementTest extends UnitTestCase {
   public function providerTestIsEmpty() {
     return [
       [[], TRUE],
+      [['#attached' => []], TRUE],
+      [['#cache' => []], TRUE],
+      [['#weight' => []], TRUE],
+      // Variations.
+      [['#attached' => [], '#cache' => []], TRUE],
+      [['#attached' => [], '#weight' => []], TRUE],
+      [['#attached' => [], '#weight' => [], '#cache' => []], TRUE],
+      [['#cache' => [], '#weight' => []], TRUE],
+      [['#cache' => [], '#weight' => [], '#any_other_property' => []], FALSE],
+      [
+        [
+          '#attached' => [],
+          '#weight' => [],
+          '#cache' => [],
+          '#any_other_property' => [],
+        ],
+        FALSE,
+      ],
+      // Cover sorting.
+      [['#cache' => [], '#weight' => [], '#attached' => []], TRUE],
+      [['#attached' => [], '#cache' => [], '#weight' => []], TRUE],
+      [['#weight' => [], '#attached' => [], '#cache' => []], TRUE],
+
       [['#cache' => []], TRUE],
       [['#cache' => ['tags' => ['foo']]], TRUE],
       [['#cache' => ['contexts' => ['bar']]], TRUE],