13 files declare their use of MethodNotAllowedException in Zircon Profile 8

ApacheUrlMatcher.php in vendor/symfony/routing/Matcher/ApacheUrlMatcher.php

ChainRouter.php in vendor/symfony-cmf/routing/ChainRouter.php

ChainRouterTest.php in vendor/symfony-cmf/routing/Tests/Routing/ChainRouterTest.php

DynamicRouter.php in vendor/symfony-cmf/routing/DynamicRouter.php

PathBasedBreadcrumbBuilder.php in core/modules/system/src/PathBasedBreadcrumbBuilder.php

Contains \Drupal\system\PathBasedBreadcrumbBuilder.

RequestMatcherInterface.php in vendor/symfony/routing/Matcher/RequestMatcherInterface.php

RouterListener.php in vendor/symfony/http-kernel/EventListener/RouterListener.php

UrlMatcher.php in vendor/symfony/routing/Matcher/UrlMatcher.php

UrlMatcherInterface.php in vendor/symfony/routing/Matcher/UrlMatcherInterface.php

UrlMatcherTest.php in vendor/symfony/routing/Tests/Matcher/UrlMatcherTest.php

url_matcher1.php in vendor/symfony/routing/Tests/Fixtures/dumper/url_matcher1.php

url_matcher2.php in vendor/symfony/routing/Tests/Fixtures/dumper/url_matcher2.php

url_matcher3.php in vendor/symfony/routing/Tests/Fixtures/dumper/url_matcher3.php