Access fields of node content type from event "rules_entity_insert:comment"
Couldn't find an answer using Rules, and ended up adding some code:

function my-module_comment_insert(Drupal\Core\Entity\EntityInterface $entity)
{
   // Get NID and load Node
   $nid = $entity-&gt;get('entity_id')-&gt;target_id;
   $node = \Drupal\node\Entity\Node::load($nid);
}


From there I can use $node->get('field_something'). Of course if it's an entity reference field (as per my case), there's some work to do.