Describe the bug
With the setting that marks duplicates as read if a duplicate exists in the top n articles enabled, duplicate articles are still showing up.

To Reproduce
Steps to reproduce the behavior:

1. Enable the setting mentioned in the title
2. Get a feed with duplicate titles, observe that the duplicates aren't marked as read.

Expected behavior
I would expect the duplicates to be marked as read.

Screenshots
The setting:

The duplicates:

Environment information (please complete the following information):

• Device: Deskop
• OS: Arch Linux (Desktop), Ubuntu Server (FreshRSS server)
• Browser: Firefox v123.0
• FreshRSS version: v123.1
• Database version: SQLite3
• PHP version: —
• Installation type: Docker

Additional context
Perhaps the issues is because of the proximity in the times of the two articles? It may not be able to flag them because they appear to arrive at the same time.