PSA: If you own Nagashizzar when the countdown to the Nagash endgame event starts, Nagash just gets it from you without a fight

So I'm playing as Imrik, and at the end of the last turn got the notification that the 10 turn countdown to the Nagash endgame crisis was starting. When this turn started, Nagashizzar, which I had captured and was building up with a crapload of high tier buildings has suddenly been gifted to Nagash.

This is some serious BS. Obviously I expected Nagash to beeline for Nagashizzar, but I thought that I would have a chance to actually fight him over it, rather than have a settlement that I had first captured and then spent many turns and tens of thousands of gold building up suddenly be gifted to him.

Feels bad man, the game should make it clear how these things are arranged to prevent surprises like this.