Describe the Bug

When I try to export books in a plaintext format with the API, it only exports the chapters list.
This is the URL I use (found in the help): http://bookstack_IP/api/books/BOOK_ID/export/plaintext
If I manually export the book from the web GUI, it works, the txt file has the whole book in it.

Steps to Reproduce

Visit the page http://bookstack_IP/api/books/BOOK_ID/export/plaintext while logged in

Expected Behaviour

In the downloaded file I expect to find the whole book.

Screenshots or Additional Context

No response

Browser Details

No response

Exact BookStack Version

V22.11.1