Steps to reproduce the issue

Install nightly staging.
See notices on the Finalization page.

Expected result

No notices.

Actual result

Notice: Undefined property: stdClass::$class in C:\xampp\htdocs\joomla-cms-staging\layouts\joomla\form\field\radio.php on line 70
None (Required for basic native multilingual site creation)	

Notice: Undefined property: stdClass::$class in C:\xampp\htdocs\joomla-cms-staging\layouts\joomla\form\field\radio.php on line 70
Blog English (GB) Sample Data
Install Joomla with a few articles and blog related modules like Older Posts, Blog Roll, Most Read Posts.

Notice: Undefined property: stdClass::$class in C:\xampp\htdocs\joomla-cms-staging\layouts\joomla\form\field\radio.php on line 70
Brochure English (GB) Sample Data
Install Joomla with a few pages (a menu with pages Home, About Us, News, Contact Us) and modules like Search, Custom, Login Form.

Notice: Undefined property: stdClass::$class in C:\xampp\htdocs\joomla-cms-staging\layouts\joomla\form\field\radio.php on line 70
Default English (GB) Sample Data	

Notice: Undefined property: stdClass::$class in C:\xampp\htdocs\joomla-cms-staging\layouts\joomla\form\field\radio.php on line 70
Learn Joomla English (GB) Sample Data	

Notice: Undefined property: stdClass::$class in C:\xampp\htdocs\joomla-cms-staging\layouts\joomla\form\field\radio.php on line 70
Test English (GB) Sample Data