Issue #3306201: Add a title getter to LinkItemInterface

core/modules/link/src/Plugin/Field/FieldType/LinkItem.php

@@ -175,6 +175,13 @@ public function getUrl() {
     return Url::fromUri($this->uri, (array) $this->options);
   }
 
+  /**
+   * {@inheritdoc}
+   */
+  public function getTitle(): ?string {
+    return $this->title ?: NULL;
+  }
+
   /**
    * {@inheritdoc}
    */