Changed the widget of shipping method from "Shipping Rate" to "Select List" in Shipment Type -> Manage Form Display -> Checkout
gave this warning and doesn't select the selected shipping method, it resets to default value every time you choose a shipping method.
Commerce shipping: 8.x-2.2
Commerce: 8.x-2.28
Warning: array_filter() expects parameter 1 to be array, null given in Drupal\commerce_shipping\Plugin\Commerce\CheckoutPane\ShippingInformation->hasRateSelected() (line 578 of /home/public_html/modules/contrib/commerce_shipping/src/Plugin/Commerce/CheckoutPane/ShippingInformation.php)
#0 /home/public_html/core/includes/bootstrap.inc(600): _drupal_error_handler_real(2, 'array_filter() ...', '/home/...', 578, Array)
#1 [internal function]: _drupal_error_handler(2, 'array_filter() ...', '/home/...', 578, Array)
#2 /home/public_html/modules/contrib/commerce_shipping/src/Plugin/Commerce/CheckoutPane/ShippingInformation.php(578): array_filter(NULL)
#3 /home/public_html/modules/contrib/commerce_shipping/src/Plugin/Commerce/CheckoutPane/ShippingInformation.php(342): Drupal\commerce_shipping\Plugin\Commerce\CheckoutPane\ShippingInformation->hasRateSelected(Array, Object(Drupal\Core\Form\FormState))
#4 /home/public_html/modules/contrib/commerce/modules/checkout/src/Plugin/Commerce/CheckoutFlow/CheckoutFlowWithPanesBase.php(546): Drupal\commerce_shipping\Plugin\Commerce\CheckoutPane\ShippingInformation->buildPaneForm(Array, Object(Drupal\Core\Form\FormState), Array)
#5 [internal function]: Drupal\commerce_checkout\Plugin\Commerce\CheckoutFlow\CheckoutFlowWithPanesBase->buildForm(Array, Object(Drupal\Core\Form\FormState), 'order_informati...')
#6 /home/public_html/core/lib/Drupal/Core/Form/FormBuilder.php(532): call_user_func_array(Array, Array)
#7 /home/public_html/core/lib/Drupal/Core/Form/FormBuilder.php(371): Drupal\Core\Form\FormBuilder->retrieveForm('commerce_checko...', Object(Drupal\Core\Form\FormState))
#8 /home/public_html/core/lib/Drupal/Core/Form/FormBuilder.php(629): Drupal\Core\Form\FormBuilder->rebuildForm('commerce_checko...', Object(Drupal\Core\Form\FormState), Array)
#9 /home/public_html/core/lib/Drupal/Core/Form/FormBuilder.php(321): Drupal\Core\Form\FormBuilder->processForm('commerce_checko...', Array, Object(Drupal\Core\Form\FormState))
#10 /home/public_html/core/lib/Drupal/Core/Form/FormBuilder.php(219): Drupal\Core\Form\FormBuilder->buildForm(Object(Drupal\commerce_checkout\Plugin\Commerce\CheckoutFlow\MultistepDefault), Object(Drupal\Core\Form\FormState))
#11 /home/public_html/modules/contrib/commerce/modules/checkout/src/Controller/CheckoutController.php(143): Drupal\Core\Form\FormBuilder->getForm(Object(Drupal\commerce_checkout\Plugin\Commerce\CheckoutFlow\MultistepDefault), 'order_informati...')
#12 [internal function]: Drupal\commerce_checkout\Controller\CheckoutController->formPage(Object(Drupal\Core\Routing\RouteMatch))
#13 /home/public_html/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(123): call_user_func_array(Array, Array)
#14 /home/public_html/core/lib/Drupal/Core/Render/Renderer.php(573): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}()
#15 /home/public_html/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(124): Drupal\Core\Render\Renderer->executeInRenderContext(Object(Drupal\Core\Render\RenderContext), Object(Closure))
#16 /home/public_html/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(97): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext(Array, Array)
#17 /home/public_html/vendor/symfony/http-kernel/HttpKernel.php(151): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}()
#18 /home/public_html/vendor/symfony/http-kernel/HttpKernel.php(68): Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object(Symfony\Component\HttpFoundation\Request), 1)
#19 /home/public_html/core/lib/Drupal/Core/StackMiddleware/Session.php(57): Symfony\Component\HttpKernel\HttpKernel->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#20 /home/public_html/core/lib/Drupal/Core/StackMiddleware/KernelPreHandle.php(47): Drupal\Core\StackMiddleware\Session->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#21 /home/public_html/core/modules/page_cache/src/StackMiddleware/PageCache.php(106): Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#22 /home/public_html/core/modules/page_cache/src/StackMiddleware/PageCache.php(85): Drupal\page_cache\StackMiddleware\PageCache->pass(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#23 /home/public_html/core/modules/ban/src/BanMiddleware.php(50): Drupal\page_cache\StackMiddleware\PageCache->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#24 /home/public_html/core/lib/Drupal/Core/StackMiddleware/ReverseProxyMiddleware.php(47): Drupal\ban\BanMiddleware->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#25 /home/public_html/core/lib/Drupal/Core/StackMiddleware/NegotiationMiddleware.php(52): Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#26 /home/public_html/vendor/stack/builder/src/Stack/StackedHttpKernel.php(23): Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#27 /home/public_html/core/lib/Drupal/Core/DrupalKernel.php(708): Stack\StackedHttpKernel->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#28 /home/public_html/index.php(19): Drupal\Core\DrupalKernel->handle(Object(Symfony\Component\HttpFoundation\Request))
#29 {main}