I am sorry, I have noticed since CF had the issues, my comment and reply was removed as it rolled back!
I can confirm this isn't a bug—it's actually working exactly as intended.
The plugin decides if a raid is "online" or "offline" at the precise moment the first entity is destroyed. So if the defenders disconnect just before this moment, the raid will count as offline, triggering the daily limit.
the cooldown isn't a limit on how long raids last overall—it's simply how long attackers can pause between destroying entities before the raid session closes. As long as attackers damage at least one entity every 45 minutes (with your config), the session remains active indefinitely.
Hope that clears things up! Let me know if you have any other questions.