diff -u b/core/modules/views/src/Plugin/views/field/FieldPluginBase.php b/core/modules/views/src/Plugin/views/field/FieldPluginBase.php
--- b/core/modules/views/src/Plugin/views/field/FieldPluginBase.php
+++ b/core/modules/views/src/Plugin/views/field/FieldPluginBase.php
@@ -1220,7 +1220,7 @@
     // We need to preserve the safeness of the value regardless of the
     // alterations made by this method. Any alterations or replacements made
     // within this method need to ensure that at the minimum the result is
-    // Xss admin filtered. See self::renderAltered() as an exmaple that does.
+    // XSS admin filtered. See self::renderAltered() as an example that does.
     $value_is_safe = SafeMarkup::isSafe($this->last_render);
     // Cast to a string so that empty checks and string functions work as
     // expected.
diff -u b/core/tests/Drupal/Tests/Core/Render/RendererTest.php b/core/tests/Drupal/Tests/Core/Render/RendererTest.php
--- b/core/tests/Drupal/Tests/Core/Render/RendererTest.php
+++ b/core/tests/Drupal/Tests/Core/Render/RendererTest.php
@@ -36,6 +36,18 @@
   ];
 
   /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp();
+    // Reset the static list of SafeStrings to prevent bleeding between tests.
+    $reflected_class = new \ReflectionClass('\Drupal\Component\Utility\SafeMarkup');
+    $reflected_property = $reflected_class->getProperty('safeStrings');
+    $reflected_property->setAccessible(true);
+    $reflected_property->setValue([]);
+  }
+
+  /**
    * @covers ::render
    * @covers ::doRender
    *