When using PHP 8.1 the following warning is displayed:
Deprecated function: Automatic conversion of false to array is deprecated in template_preprocess_panelizer_wizard_tree() (line 369 of modules/contrib/panelizer/panelizer.module).
template_preprocess_panelizer_wizard_tree(Array, 'panelizer_wizard_tree', Array)
call_user_func_array('template_preprocess_panelizer_wizard_tree', Array) (Line: 287)
Drupal\Core\Theme\ThemeManager->render('panelizer_wizard_tree', Array) (Line: 422)
Drupal\Core\Render\Renderer->doRender(Array, ) (Line: 201)
Drupal\Core\Render\Renderer->render(Array) (Line: 479)Closed: duplicate
5.0
Code
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
Attached a patch that provides empty array when tree is empty.
This bug is fixed in https://www.drupal.org/project/panelizer/issues/3352704 🐛 Drupal 10 compatibility fixes follow up Fixed and already committed to 8.x-4.x-dev so we can close this ticket.