Incarnation of Dread Boss - bugged phases

I know that nobody from GGG gives a shit but it's not possible to kill this your new uber super mega hyper funny boss....

In the 1st phase he became untargetable and you should collect red and blue whatever and bring it to him. You will run to the blue statue (it disssapear) then red statue (it dissapear) then to the boss in the middle of the arena and ... nothing. Nothing happened and nothing more is in the arena except you, boss and shit tons of blue little balls.

So I waited here for 10 minutes and then disconnect occured and I lost my other portals.

So if anyone from GGG is reading this, please tell to someone. (I am not naive, I know that staff is caring only about money but still...)

POSSIBLE SOLUTION:

I got a tip that you must kill this boss without any death or without leaving the arena. If you will leave the arena (disconnect / death / something else) you are done and you can start again.