diff --git a/src/Plugin/Field/FieldWidget/InlineParagraphsWidget.php b/src/Plugin/Field/FieldWidget/InlineParagraphsWidget.php
index 0c2e028..305e30a 100644
--- a/src/Plugin/Field/FieldWidget/InlineParagraphsWidget.php
+++ b/src/Plugin/Field/FieldWidget/InlineParagraphsWidget.php
@@ -231,6 +231,8 @@ class InlineParagraphsWidget extends WidgetBase {
     $info = [];
 
     $paragraphs_entity = NULL;
+    /** @var \Drupal\Core\Entity\Display\EntityFormDisplayInterface $display */
+    $display = NULL;
     $host = $items->getEntity();
     $widget_state = static::getWidgetState($parents, $field_name, $form_state);
 
@@ -278,26 +280,33 @@ class InlineParagraphsWidget extends WidgetBase {
       $item_mode = $default_edit_mode;
     }
 
-    if ($item_mode == 'closed' && $paragraphs_entity &&
-        isset($widget_state['paragraphs'][$delta]['display'])) {
-      // Validate closed paragraphs and expand if needed.
+    // Initialize the form display.
+    if ($paragraphs_entity) {
+      $display = EntityFormDisplay::collectRenderDisplay($paragraphs_entity, $this->getSetting('form_display_mode'));
+    }
+
+    // Validate closed paragraphs and expand if needed.
+    if ($item_mode == 'closed' && $paragraphs_entity && $display) {
       // @todo Consider recursion.
       // @todo Is this needed anymore once the collapse button validate the
       // subform fields?
-      /** @var \Drupal\Core\Entity\Display\EntityFormDisplayInterface $display */
-      $display = $widget_state['paragraphs'][$delta]['display'];
       $violations = $paragraphs_entity->validate();
       $violations->filterByFieldAccess();
       if ($violations->count() > 0) {
+        $violations_excluded_fields = [];
         foreach ($violations->getFieldNames() as $field_name) {
           // Only show violations for fields that actually appear in the form,
           // and let the widget assign the violations to the correct form
           // elements.
           if (!$display->getRenderer($field_name)) {
-            $violations->filterByFields([$field_name]);
+            $violations_excluded_fields[] = $field_name;
           }
         }
 
+        if ($violations_excluded_fields) {
+          $violations->filterByFields($violations_excluded_fields);
+        }
+
         // If violations for this form mode ...
         if ($violations->count() > 0) {
           // Switch mode to 'edit' so that the subform is built.
@@ -643,8 +652,6 @@ class InlineParagraphsWidget extends WidgetBase {
         }
       }
 
-      $display = EntityFormDisplay::collectRenderDisplay($paragraphs_entity, $this->getSetting('form_display_mode'));
-
       // @todo Remove as part of https://www.drupal.org/node/2640056
       if (\Drupal::moduleHandler()->moduleExists('field_group')) {
         $context = [
diff --git a/src/Plugin/Field/FieldWidget/ParagraphsWidget.php b/src/Plugin/Field/FieldWidget/ParagraphsWidget.php
index ea9b551..104960a 100644
--- a/src/Plugin/Field/FieldWidget/ParagraphsWidget.php
+++ b/src/Plugin/Field/FieldWidget/ParagraphsWidget.php
@@ -226,6 +226,8 @@ class ParagraphsWidget extends WidgetBase {
 
     /** @var \Drupal\paragraphs\Entity\Paragraph $paragraphs_entity */
     $paragraphs_entity = NULL;
+    /** @var \Drupal\Core\Entity\Display\EntityFormDisplayInterface $display */
+    $display = NULL;
     $host = $items->getEntity();
     $widget_state = static::getWidgetState($parents, $field_name, $form_state);
 
@@ -269,26 +271,33 @@ class ParagraphsWidget extends WidgetBase {
       $item_mode = 'edit';
     }
 
-    if ($item_mode == 'closed' && $paragraphs_entity &&
-        isset($widget_state['paragraphs'][$delta]['display'])) {
-      // Validate closed paragraphs and expand if needed.
+    // Initialize the form display.
+    if ($paragraphs_entity) {
+      $display = EntityFormDisplay::collectRenderDisplay($paragraphs_entity, $this->getSetting('form_display_mode'));
+    }
+
+    // Validate closed paragraphs and expand if needed.
+    if ($item_mode == 'closed' && $paragraphs_entity && $display) {
       // @todo Consider recursion.
       // @todo Is this needed anymore once the collapse button validate the
       // subform fields?
-      /** @var \Drupal\Core\Entity\Display\EntityFormDisplayInterface $display */
-      $display = $widget_state['paragraphs'][$delta]['display'];
       $violations = $paragraphs_entity->validate();
       $violations->filterByFieldAccess();
       if ($violations->count() > 0) {
+        $violations_excluded_fields = [];
         foreach ($violations->getFieldNames() as $field_name) {
           // Only show violations for fields that actually appear in the form,
           // and let the widget assign the violations to the correct form
           // elements.
           if (!$display->getRenderer($field_name)) {
-            $violations->filterByFields([$field_name]);
+            $violations_excluded_fields[] = $field_name;
           }
         }
 
+        if ($violations_excluded_fields) {
+          $violations->filterByFields($violations_excluded_fields);
+        }
+
         // If violations for this form mode ...
         if ($violations->count() > 0) {
           // Switch mode to 'edit' so that the subform is built.
@@ -582,8 +591,6 @@ class ParagraphsWidget extends WidgetBase {
         }
       }
 
-      $display = EntityFormDisplay::collectRenderDisplay($paragraphs_entity, $this->getSetting('form_display_mode'));
-
       // @todo Remove as part of https://www.drupal.org/node/2640056
       if (\Drupal::moduleHandler()->moduleExists('field_group')) {
         $context = [
diff --git a/src/Tests/Classic/ParagraphsAdministrationTest.php b/src/Tests/Classic/ParagraphsAdministrationTest.php
index 25ecf74..c4a3d4f 100644
--- a/src/Tests/Classic/ParagraphsAdministrationTest.php
+++ b/src/Tests/Classic/ParagraphsAdministrationTest.php
@@ -456,7 +456,6 @@ class ParagraphsAdministrationTest extends ParagraphsTestBase {
     ]);
     $this->clickLink(t('Manage form display'));
     $this->drupalPostForm(NULL, array('fields[field_entity_reference][type]' => 'entity_reference_autocomplete'), t('Save'));
-    $this->drupalPostForm(NULL, [], 'Save');
 
     $node = $this->drupalGetNodeByTitle('Nested twins');
 
diff --git a/src/Tests/Experimental/ParagraphsExperimentalAdministrationTest.php b/src/Tests/Experimental/ParagraphsExperimentalAdministrationTest.php
index ad78e6a..c2b2d02 100644
--- a/src/Tests/Experimental/ParagraphsExperimentalAdministrationTest.php
+++ b/src/Tests/Experimental/ParagraphsExperimentalAdministrationTest.php
@@ -452,7 +452,6 @@ class ParagraphsExperimentalAdministrationTest extends ParagraphsExperimentalTes
     ]);
     $this->clickLink(t('Manage form display'));
     $this->drupalPostForm(NULL, array('fields[field_entity_reference][type]' => 'entity_reference_autocomplete'), t('Save'));
-    $this->drupalPostForm(NULL, [], 'Save');
 
     $node = $this->drupalGetNodeByTitle('Nested twins');