Manor map boss fight won't trigger

The fight won't start. I relogged, I used a portal, I cleared the whole map and returned. I unequipped my talisman and scepter, because talismans are really buggy and sometimes things get fixed by unequipping, such as interacting with the abyssal depths portal. I used Walking Calamity and Roar in an attempt to aggro them. Nothing. It's a 6-mod rare map, without tablets, T15. I can't die to "reset" the map because it's a 1-portal map.

There is /bug on the attached screenshot (number 2,581,299,625).

Please look into it, or maybe propose a workaround for another time, if I encounter the same issue.

Thank you in advance