Fails on install

The patch at https://www.drupal.org/project/domain_simple_sitemap/issues/3351261 🐛 Compatibility with 4.x version simple_sitemap Closed: duplicate seemed to fix the failure to install; HOWEVER, now it says:

Symfony\Component\Routing\Exception\RouteNotFoundException: Route "domain_simple_sitemap.settings" does not exist. in Drupal\Core\Routing\RouteProvider->getRouteByName() (line 206 of core/lib/Drupal/Core/Routing/RouteProvider.php).
Drupal\Core\Menu\LocalTaskDefault->getRouteParameters(Object) (Line: 310)
Drupal\Core\Menu\LocalTaskManager->getTasksBuild('domain.admin', Object) (Line: 358)

otherwise if installing by itself AFTER simple sitemap already installed it throws the following error on attempt to install

The website encountered an unexpected error. Please try again later.
Error: Class "Drupal\simple_sitemap\Controller\SimplesitemapController" not found in include() (line 17 of modules/domain_simple_sitemap/src/Controller/DomainSimpleSitemapController.php).
include() (Line: 582)
Composer\Autoload\{closure}('/public_html/modules/domain_simple_sitemap/src/Controller/DomainSimpleSitemapController.php') (Line: 433)
Composer\Autoload\ClassLoader->loadClass('Drupal\domain_simple_sitemap\Controller\DomainSimpleSitemapController')
ReflectionMethod->__construct('\Drupal\domain_simple_sitemap\Controller\DomainSimpleSitemapController', 'getSitemap') (Line: 135)
Drupal\Core\Entity\EntityResolverManager->setParametersFromReflection(Array, Object) (Line: 221)
Drupal\Core\Entity\EntityResolverManager->setRouteOptions(Object) (Line: 48)
Drupal\Core\EventSubscriber\EntityRouteAlterSubscriber->onRoutingRouteAlterSetType(Object, 'routing.route_alter', Object)
call_user_func(Array, Object, 'routing.route_alter', Object) (Line: 142)
Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch(Object, 'routing.route_alter') (Line: 189)
Drupal\Core\Routing\RouteBuilder->rebuild() (Line: 83)
Drupal\Core\ProxyClass\Routing\RouteBuilder->rebuild() (Line: 377)
Drupal\Core\Extension\ModuleInstaller->install(Array, 1) (Line: 83)
Drupal\Core\ProxyClass\Extension\ModuleInstaller->install(Array) (Line: 502)
Drupal\system\Form\ModulesListForm->submitForm(Array, Object)
call_user_func_array(Array, Array) (Line: 114)
Drupal\Core\Form\FormSubmitter->executeSubmitHandlers(Array, Object) (Line: 52)
Drupal\Core\Form\FormSubmitter->doSubmitForm(Array, Object) (Line: 595)
Drupal\Core\Form\FormBuilder->processForm('system_modules', Array, Object) (Line: 323)
Drupal\Core\Form\FormBuilder->buildForm(Object, Object) (Line: 73)
Drupal\Core\Controller\FormController->getContentResult(Object, Object)
call_user_func_array(Array, Array) (Line: 123)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() (Line: 580)
Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 124)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext(Array, Array) (Line: 97)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() (Line: 169)
Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) (Line: 81)
Symfony\Component\HttpKernel\HttpKernel->handle(Object, 1, 1) (Line: 58)
Drupal\Core\StackMiddleware\Session->handle(Object, 1, 1) (Line: 48)
Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object, 1, 1) (Line: 106)
Drupal\page_cache\StackMiddleware\PageCache->pass(Object, 1, 1) (Line: 85)
Drupal\page_cache\StackMiddleware\PageCache->handle(Object, 1, 1) (Line: 48)
Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object, 1, 1) (Line: 51)
Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object, 1, 1) (Line: 23)
Stack\StackedHttpKernel->handle(Object, 1, 1) (Line: 718)
Drupal\Core\DrupalKernel->handle(Object) (Line: 19)