Twig theming boolean issue
As discussed in the linked topic use database values to check for booleans in a condition. In a View template you'll find for each row the entity the row is based on in row._entity, from which you can get the raw field values:

{% if row._entity.field_new.value %}
  &lt;div class="info--details__new"&gt;
    {{ fields.field_new.content }}
  &lt;/div&gt;
{% endif %}


Even if it works with debugging turned off, you still depend on how you've configured the rendered output and this is not good practice, if a small change in UI can break the code.