Array to string conversion in ::processCheckbox
>>> [!note] Migrated issue
<!-- Drupal.org comment -->
<!-- Migrated from issue #3240983. -->
Reported by: [dimilias](https://www.drupal.org/user/2578708)
Related to !1
>>>
<p>When editing a link, the following check is being made in the <code>menu_link_destination_form_menu_link_content_menu_link_content_form_alter</code>.<br>
<img src="https://www.drupal.org/files/issues/2021-10-06/Screenshot%202021-10-06%20092807.png" alt="error"></p>
<p>This is because the <code>menu_link_destination</code> is stored in an array with </p>
<pre>'options' => [<br> 'menu_link_destination' => $value,<br>];</pre><p>
<img src="https://www.drupal.org/files/issues/2021-10-06/Screenshot%202021-10-06%20093043.png" alt="storage"></p>
<p>The value should be assigned as a default value and not the array.</p>
issue