lazy_builder in social_admin_menu_toolbar_alter causes DomainException

Problem

The #lazy_builder property was added to the render array which caused the following error.

 Type       :  php                                                             
 Severity   :  error                                                           
 Message    :  DomainException: When a #lazy_builder callback is specified, no 
               properties can exist; all properties must be generated by the   
               #lazy_builder callback. You specified the following properties: 
               #pre_render, #type, #attributes, #process, #theme_wrappers,     
               #defaults_loaded. in Drupal\Core\Render\Renderer->doRender()    
               (line 333 of                                                    
               /var/www/html/core/lib/Drupal/Core/Render/Renderer.php).  

Solution

Nuke the render array instead.