diff --git a/lib/API/JSON/v1/Forms.php b/lib/API/JSON/v1/Forms.php
index c8467b35d9..07acc90d3a 100644
--- a/lib/API/JSON/v1/Forms.php
+++ b/lib/API/JSON/v1/Forms.php
@@ -209,27 +209,20 @@ class Forms extends APIEndpoint {
 
     // check if the user gets to pick his own lists
     // or if it's selected by the admin
-    $hasSegmentSelection = false;
+    $formEntity = new FormEntity($name);
+    $formEntity->setBody($body);
+    $listSelectionBlocks = $formEntity->getBlocksByType(FormEntity::SEGMENT_SELECTION_BLOCK_TYPE);
     $listSelection = [];
-    foreach ($body as $i => $block) {
-      if ($block['type'] === 'segment') {
-        $hasSegmentSelection = true;
-        if (!empty($block['params']['values'])) {
-          $listSelection = array_filter(
-            array_map(function($segment) {
-              return (isset($segment['id'])
-                ? $segment['id']
-                : null
-              );
-            }, $block['params']['values'])
-          );
-        }
-        break;
-      }
+    foreach ($listSelectionBlocks as $listSelectionBlock) {
+      $listSelection = array_unique(
+        array_merge(
+          $listSelection, array_column($listSelectionBlock['params']['values'] ?? [], 'id')
+        )
+      );
     }
 
     // check list selection
-    if ($hasSegmentSelection === true) {
+    if (count($listSelectionBlocks)) {
       $settings['segments_selected_by'] = 'user';
       $settings['segments'] = $listSelection;
     } else {
diff --git a/tests/integration/API/JSON/v1/FormsTest.php b/tests/integration/API/JSON/v1/FormsTest.php
index d19bb6c0da..82916fc797 100644
--- a/tests/integration/API/JSON/v1/FormsTest.php
+++ b/tests/integration/API/JSON/v1/FormsTest.php
@@ -133,6 +133,36 @@ class FormsTest extends \MailPoetTest {
     expect($response->data['settings']['segments'])->equals([1, 3]);
   }
 
+  public function testItCanExtractListsFromNestedListSelectionBlock() {
+    $response = $this->endpoint->create();
+    expect($response->status)->equals(APIResponse::STATUS_OK);
+
+    $form = Form::findOne($response->data['id'])->asArray();
+    $form['body'][] = [
+      'type' => 'segment',
+      'params' => [
+        'values' => [['id' => 2], ['id' => 4]],
+      ],
+    ];
+
+    $form['body'] = [
+      [
+        'type' => 'columns',
+        'body' => [
+          [
+            'type' => 'column',
+            'body' => $form['body'],
+          ],
+        ],
+      ],
+    ];
+
+    $response = $this->endpoint->saveEditor($form);
+    expect($response->status)->equals(APIResponse::STATUS_OK);
+    expect($response->data['settings']['segments_selected_by'])->equals('user');
+    expect($response->data['settings']['segments'])->equals([2, 4]);
+  }
+
   public function testItCanRestoreAForm() {
     $this->form1->trash();