Incompatibility with FreshRSS Fever API

[supermamie]

Describe the bug
I connected Fluent to my FreshRSS (hosted on a YunoHost, in case it changes anything). The connection is OK and it fetch my feeds, but they are all considered as empty.
Another useful info : I have hundreds of feeds and thousands of unread articles (so many that some apps crash due to this)

To Reproduce
Steps to reproduce the behavior:

1. Install a FreshRSS somewhere
2. Connect Fluent to it
3. Try to read your feeds
4. Nothing to read

Screenshots

Platform (please complete the following information):

• OS: Ubuntu 20.04
• Version 0.7.0

Additional context
I found no relevant logs server-side, and I have no idea on where to search for logs in this app