[Beta1] TypeError Exception when creating Template Hook for System: front/staffdirectory/layout_blocks

Hello,

Trying to create a Template Hook for System: front/staffdirectory/layout_blocks does not work.

The same result under PHP 8.1.29 and 8.2.24

1. "View Template" does not work - displays a blank popup
    
2. TypeError exception when saving the template (e.g. "<li>HELP</li>" before closing tag)

TypeError: implode(): Argument #1 ($array) must be of type array, string given (0)
#0 /home/bn2468/public_html/system/Theme/CustomTemplate.php(774): implode()
#1 /home/bn2468/public_html/system/Helpers/Form/FormAbstract.php(419): IPS\Theme\CustomTemplate->IPS\Theme\{closure}()
#2 /home/bn2468/public_html/system/Helpers/Form/TextArea.php(146): IPS\Helpers\Form\FormAbstract->validate()
#3 /home/bn2468/public_html/system/Helpers/Form/FormAbstract.php(207): IPS\Helpers\Form\TextArea->validate()
#4 /home/bn2468/public_html/system/Helpers/Form/FormAbstract.php(184): IPS\Helpers\Form\FormAbstract->setValue()
#5 /home/bn2468/public_html/system/Helpers/Form/TextArea.php(93): IPS\Helpers\Form\FormAbstract->__construct()
#6 /home/bn2468/public_html/system/Helpers/Form/Codemirror.php(82): IPS\Helpers\Form\TextArea->__construct()
#7 /home/bn2468/public_html/system/Theme/CustomTemplate.php(784): IPS\Helpers\Form\Codemirror->__construct()
#8 /home/bn2468/public_html/applications/core/modules/admin/developer/customtemplates.php(163): IPS\Theme\CustomTemplate->form()
#9 /home/bn2468/public_html/system/Dispatcher/Controller.php(128): IPS\core\modules\admin\developer\customtemplates->customTemplateForm()
#10 /home/bn2468/public_html/system/Developer/Controller.php(92): IPS\Dispatcher\Controller->execute()
#11 /home/bn2468/public_html/system/Dispatcher/Dispatcher.php(169): IPS\Developer\Controller->execute()
#12 /home/bn2468/public_html/admin/index.php(15): IPS\Dispatcher->run()
#13 {main}

Thanks very much...

John