Drupal 8 Custom Content Entity unable to save programmatically

Issue:

Created a custom content entity. This entity will have data programmatically created for it by the application, and as such, calls the simple create method of the entityTypeManager and then calls the save method on the resulting created entity.

Here's the code I use where '....entity....' is the id of the content entity:

$new= \Drupal::entityTypeManager()->getStorage('...entity...')->create($values);
$new->save();

Upon saving, the site successfully saves the content entity into the database with all of the appropriate values, however, it then trows this error:

Recoverable fatal error: Argument 1 passed to Drupal\Core\Routing\RequestContext::fromRequest() must be an instance of Symfony\Component\HttpFoundation\Request, null given, called in ...\lib\Drupal\Core\Routing\RequestContext.php on line 31 and defined in Drupal\Core\Routing\RequestContext->fromRequest() (line 37 of core\lib\Drupal\Core\Routing\RequestContext.php).

Drupal\Core\Routing\RequestContext->fromRequest(NULL) (Line: 31)
Drupal\Core\Routing\RequestContext->fromRequestStack(Object)
call_user_func_array(Array, Array) (Line: 332)
Drupal\Component\DependencyInjection\Container->createService(Array, 'router.request_context') (Line: 177)
Drupal\Component\DependencyInjection\Container->get('router.request_context', 3) (Line: 494)
Drupal\Component\DependencyInjection\Container->resolveServicesAndParameters(Object) (Line: 329)
Drupal\Component\DependencyInjection\Container->createService(Array, 'private__b7bcd0b1968d44ae44212040b5b5ae5a1185e77f') (Line: 509)
Drupal\Component\DependencyInjection\Container->resolveServicesAndParameters(Object) (Line: 236)
Drupal\Component\DependencyInjection\Container->createService(Array, 'url_generator') (Line: 177)
Drupal\Component\DependencyInjection\Container->get('url_generator', 1) (Line: 494)
Drupal\Component\DependencyInjection\Container->resolveServicesAndParameters(Object) (Line: 236)
Drupal\Component\DependencyInjection\Container->createService(Array, 'comment.manager') (Line: 177)
Drupal\Component\DependencyInjection\Container->get('comment.manager') (Line: 158)
Drupal::service('comment.manager') (Line: 377)
comment_entity_insert(Object)
call_user_func_array('comment_entity_insert', Array) (Line: 402)
Drupal\Core\Extension\ModuleHandler->invokeAll('entity_insert', Array) (Line: 169)
Drupal\Core\Entity\EntityStorageBase->invokeHook('insert', Object) (Line: 418)
Drupal\Core\Entity\ContentEntityStorageBase->invokeHook('insert', Object) (Line: 470)
Drupal\Core\Entity\EntityStorageBase->doPostSave(Object, ) (Line: 304)
Drupal\Core\Entity\ContentEntityStorageBase->doPostSave(Object, ) (Line: 395)
Drupal\Core\Entity\EntityStorageBase->save(Object) (Line: 761)
Drupal\Core\Entity\Sql\SqlContentEntityStorage->save(Object) (Line: 364)
Drupal\Core\Entity\Entity->save() (Line: 188)

This is happening in the save method. When you look at the trace, it all starts in the post-entity save module invocation and lands in the comment module.

I've tried the exact same save routine with the example module's content entity example to be sure it's not just my custom code with the exact same results. It succeeds on the save, but fails in the post-save invocation.

If I put a return in the function comment_entity_insert, the save works perfectly each time.

Is this a D8 core comment issue or a piece of functionality that needs to be documented to disable the comments?