diff --git a/src/Plugin/Field/FieldWidget/InlineParagraphsWidget.php b/src/Plugin/Field/FieldWidget/InlineParagraphsWidget.php
index 5772c95..4c29867 100644
--- a/src/Plugin/Field/FieldWidget/InlineParagraphsWidget.php
+++ b/src/Plugin/Field/FieldWidget/InlineParagraphsWidget.php
@@ -1082,8 +1082,9 @@ class InlineParagraphsWidget extends WidgetBase {
 
         /** @var \Drupal\Core\Entity\Display\EntityFormDisplayInterface $display */
         $display =  $widget_state['paragraphs'][$item['_original_delta']]['display'];
-        $display->extractFormValues($paragraphs_entity, $element[$item['_original_delta']]['subform'], $form_state);
-
+        if ($widget_state['paragraphs'][$delta]['mode'] == 'edit') {
+          $display->extractFormValues($paragraphs_entity, $element[$item['_original_delta']]['subform'], $form_state);
+        }
         $paragraphs_entity->setNewRevision($new_revision);
         // A content entity form saves without any rebuild. It needs to set the
         // language to update it in case of language change.
diff --git a/src/Tests/ParagraphsInlineEntityFormTest.php b/src/Tests/ParagraphsInlineEntityFormTest.php
new file mode 100644
index 0000000..906f878
--- /dev/null
+++ b/src/Tests/ParagraphsInlineEntityFormTest.php
@@ -0,0 +1,87 @@
+<?php
+
+namespace Drupal\paragraphs\Tests;
+
+/**
+ * Tests the configuration of paragraphs in relation to ief.
+ *
+ * @group paragraphs
+ */
+class ParagraphsInlineEntityFormTest extends ParagraphsTestBase {
+
+  /**
+   * Modules to enable.
+   *
+   * @var array
+   */
+  public static $modules = [
+    'inline_entity_form',
+  ];
+
+  /**
+   * Tests the revision of paragraphs.
+   */
+  public function testParagraphsIEFPreview() {
+    // Create article content type with a paragraphs field.
+    $this->addParagraphedContentType('article', 'field_paragraphs');
+    $this->loginAsAdmin(['create article content', 'edit any article content']);
+
+    // Create the paragraphs type simple.
+    $this->addParagraphsType('simple');
+
+    // Create a reference to an article.
+    $this->fieldUIAddNewField('admin/structure/paragraphs_type/simple', 'article', 'Article', 'field_ui:entity_reference:node', [
+      'settings[target_type]' => 'node',
+      'cardinality' => 'number',
+      'cardinality_number' => 1,
+    ], [
+      'required' => TRUE,
+      'settings[handler_settings][target_bundles][article]' => TRUE
+    ]);
+
+    // Enable IEF simple widget.
+    $this->drupalGet('admin/structure/paragraphs_type/simple/form-display');
+    $edit = [
+      'fields[field_article][type]' => 'inline_entity_form_simple',
+    ];
+    $this->drupalPostForm(NULL, $edit, t('Save'));
+
+    // Set the paragraphs widget mode to preview.
+    $this->setParagraphsWidgetMode('article', 'field_paragraphs', 'preview');
+
+    // Create node with one paragraph.
+    $this->drupalGet('node/add/article');
+    $this->drupalPostAjaxForm(NULL, [], 'field_paragraphs_simple_add_more');
+
+    // Set the values and save.
+    $edit = [
+      'title[0][value]' => 'Dummy1',
+      'field_paragraphs[0][subform][field_article][0][inline_entity_form][title][0][value]' => 'Dummy2',
+    ];
+    $this->drupalPostForm(NULL, $edit, t('Save and publish'));
+
+    // Go back into edit page.
+    $node = $this->getNodeByTitle('Dummy1');
+    $this->drupalGet('node/' . $node->id() . '/edit');
+
+    // Try to open the previewed paragraph.
+    $this->drupalPostAjaxForm(NULL, [], 'field_paragraphs_0_edit');
+  }
+
+  /**
+   * Sets the Paragraphs widget display mode.
+   *
+   * @param string $content_type
+   *   Content type name where to set the widget mode.
+   * @param string $paragraphs_field
+   *   Paragraphs field to change the mode.
+   * @param string $mode
+   *   Mode to be set. ('closed', 'preview' or 'open').
+   */
+  protected function setParagraphsWidgetMode($content_type, $paragraphs_field, $mode) {
+    $this->drupalGet('admin/structure/types/manage/' . $content_type . '/form-display');
+    $this->drupalPostAjaxForm(NULL, [], $paragraphs_field . '_settings_edit');
+    $this->drupalPostForm(NULL, ['fields[' . $paragraphs_field . '][settings_edit_form][settings][edit_mode]' => $mode], t('Update'));
+    $this->drupalPostForm(NULL, [], 'Save');
+  }
+}