As described in a related core issue ( 🐛 Path module calls getInternalPath without checking if the url is routed Needs work ) I'm using a bundle class to override the toUrl() method on a particular node type. In particular, there's a link field that, if populated, will be used by the toUrl() method. The reason is that we want to allow cards to link to internal or external links (or no link whatsoever) as elegantly as possible.
The redirect_form_node_form_alter function is triggering the following exception:
UnexpectedValueException: Unrouted URIs do not have internal representations. in Drupal\Core\Url->getInternalPath()
Use a bundle class with an override for toUrl that results in an unrouted uri for the node.
In addition to checking $entity->isNew() also check for $entity->toUrl()->isRouted().
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Needs review
1.0
Code
Here's a hopefully inoffensive patch.
