Warning: Undefined array key "#type" en Drupal\Core\Form\FormHelper::processStates()

Problem/Motivation

Trying to add the commerce webform order in a site having a commerce order item type with bundle fields, it appears this warning: "Warning: Undefined array key "#type" en Drupal\Core\Form\FormHelper::processStates() "

Steps to reproduce

1. Have a site with an order item type with bundle fields . It can happen also if it has just extra base fields.
2. Add commerce order Webform handler (it needs to be applied the patch from this issue first).

Proposed resolution

Fix this part of the code, because is adding the states in the key "$form['tabs_wrapper']['order_item'][$order_item_id][$field_id]" instead of "$form['tabs_wrapper']['order_item']['bundles'][$order_item_id][$field_id]".