Steps to repeat:
1. Add a Text (plain) field to a content type
2. Edit the display of the field and check "Link to the Content" setting in the format settings.
3. Display the field in the default view mode
3. Create a new node and click "Preview" before saving.
Expected Results:
User sees preview of content
Actual Results:
PHP Error: Drupal\Core\Entity\EntityMalformedException: The "node" entity cannot have a URI as it does not have an ID in Drupal\Core\Entity\Entity->toUrl() (line 180 of /home/d2xle/www/core/lib/Drupal/Core/Entity/Entity.php).