How to print the URL path of a referenced node using paragraphs?
Use the Twig path() function and build a node route with the target id of the reference field:

paragraph.html.twig

{% if paragraph.field_example.target_id %}
  &lt;a href="{{ path('entity.node.canonical', {'node': paragraph.field_example.target_id}) }}"&gt;{{ 'View node page'|t }}&lt;/a&gt;
{% endif %}


See https://www.drupal.org/docs/8/theming/twig/functions-in-twig-templates