I was faced with the following situation:
I sent a portion of my fleet to a fleet destruction attack. I included an overwhelming number of fodder ships, and a fair number of cruisers and battleships. Apart from his other ships,
the defender presented 7 Battlecruisers.
The battle lasted for two rounds. In the first round, quite a few of my fodder ships went down as well as 5 battleships. All of the defender's ships went down, apart from 4 Battlecruisers.
In the second round, none of my fodder ships was lost, while I lost 10 battleships before the defender's 4 battlecruisers were destroyed.
It was therefore clearly seen that Battlecruisers aimed straight on battleships and were particularly deadly. It is stated, of course, that "Battleships are particularly deadly when defending against attacking fleets".
However, I thought that this was only due to the Rapid Fire advantage that they have against Battleships. However, Rapid Fire has not yet been released. Is there any other special "Plus" that Battlecruisers have when they are on defense?

Its a bug, ships just randomly die (Seems that BS die more often than others). Its the same reason LS can destroy DS.

Do not pay attention to the written description of ships, it means nothing. Only the stats matter