#ajax callback

Thanks @jsacksick sorry I didn't see that! Moved over to Commerce Shipping!

Shouldn't that be a commerce_shipping issue? I don't see commerce in the stracktrace though...

I can sadly confirm this with latest 8.x-2.40 on latest Drupal 10.

Some more details from the logs:

Location: /checkout/2986/order_information?_wrapper_format=drupal_ajax&ajax_form=1
Referrer: /checkout/2986/order_information

#0 /web/core/lib/Drupal/Core/Form/EventSubscriber/FormAjaxSubscriber.php(112): Drupal\Core\Form\FormAjaxResponseBuilder->buildResponse()
#1 [internal function]: Drupal\Core\Form\EventSubscriber\FormAjaxSubscriber->onException()
#2 /web/core/lib/Drupal/Component/EventDispatcher/ContainerAwareEventDispatcher.php(111): call_user_func()
#3 /vendor/symfony/http-kernel/HttpKernel.php(239): Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch()
#4 /vendor/symfony/http-kernel/HttpKernel.php(91): Symfony\Component\HttpKernel\HttpKernel->handleThrowable()
#5 /web/core/lib/Drupal/Core/StackMiddleware/Session.php(53): Symfony\Component\HttpKernel\HttpKernel->handle()
#6 /web/core/lib/Drupal/Core/StackMiddleware/KernelPreHandle.php(48): Drupal\Core\StackMiddleware\Session->handle()
#7 /web/core/lib/Drupal/Core/StackMiddleware/ContentLength.php(28): Drupal\Core\StackMiddleware\KernelPreHandle->handle()
#8 /web/core/modules/big_pipe/src/StackMiddleware/ContentLength.php(32): Drupal\Core\StackMiddleware\ContentLength->handle()
#9 /web/core/modules/page_cache/src/StackMiddleware/PageCache.php(116): Drupal\big_pipe\StackMiddleware\ContentLength->handle()
#10 /web/core/modules/page_cache/src/StackMiddleware/PageCache.php(90): Drupal\page_cache\StackMiddleware\PageCache->pass()
#11 /web/core/modules/ban/src/BanMiddleware.php(50): Drupal\page_cache\StackMiddleware\PageCache->handle()
#12 /web/core/lib/Drupal/Core/StackMiddleware/ReverseProxyMiddleware.php(48): Drupal\ban\BanMiddleware->handle()
#13 /web/core/lib/Drupal/Core/StackMiddleware/NegotiationMiddleware.php(51): Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle()
#14 /web/core/lib/Drupal/Core/StackMiddleware/AjaxPageState.php(36): Drupal\Core\StackMiddleware\NegotiationMiddleware->handle()
#15 /web/modules/contrib/remove_http_headers/src/StackMiddleware/RemoveHttpHeadersMiddleware.php(49): Drupal\Core\StackMiddleware\AjaxPageState->handle()
#16 /web/core/lib/Drupal/Core/StackMiddleware/StackedHttpKernel.php(51): Drupal\remove_http_headers\StackMiddleware\RemoveHttpHeadersMiddleware->handle()
#17 /web/core/lib/Drupal/Core/DrupalKernel.php(741): Drupal\Core\StackMiddleware\StackedHttpKernel->handle()
#18 /web/index.php(19): Drupal\Core\DrupalKernel->handle()
#19 {main}

Maybe an AJAX callback has a missing "static"?
See https://julian.pustkuchen.com/en/external-drupal-ajax-callback-methods-m...

Hope I'll find some time for further investigations.

Seems to happen in regular customer checkout.