After some changes in Logseq, Readwise had to make some corrections to the default export settings for page metadata. The slash was suddenly showing in Logseq in the page properties.
I adapted the query shown above with those same changes:
author:: [[{{author}}]]
full-title:: "{{full_title}}"
category:: #{{category}}{{ " 📚" if category == "books"}}{{" 📰" if category == "articles"}}{{" 🐦" if category == "tweets"}}{{" 🎙" if category == "podcasts"}}
{% if url -%}
url:: {{url}}
{% endif -%}
{% if document_note -%}
document_note:: {{document_note}}
{% endif -%}
{% if document_tags -%}
tags:: {% for tag in document_tags %}#[[{{tag}}]] {% endfor %}
{% endif -%}
{% if image_url -%}
{% endif -%}