6 files declare their use of ParamNotConvertedException in Zircon Profile 8

AccessManager.php in core/lib/Drupal/Core/Access/AccessManager.php

Contains \Drupal\Core\Access\AccessManager.

ParamConversionEnhancer.php in core/lib/Drupal/Core/Routing/Enhancer/ParamConversionEnhancer.php

Contains \Drupal\Core\Routing\Enhancer\ParamConversionEnhancer.

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

Contains \Drupal\system\PathBasedBreadcrumbBuilder.

PathValidator.php in core/lib/Drupal/Core/Path/PathValidator.php

Contains \Drupal\Core\Path\PathValidator.

PathValidatorTest.php in core/tests/Drupal/Tests/Core/Path/PathValidatorTest.php

Contains \Drupal\Tests\Core\Path\PathValidatorTest.

TestControllers.php in core/modules/system/tests/modules/router_test_directory/src/TestControllers.php

Contains \Drupal\router_test\TestControllers.