I just died in a fight against an elite boss in a monolith. I got the usual “Respawn” button, which ends the Monolith run, however… my minions were able to kill the elite after my death! The “Open Portal” button still appeared and I was able to click on it. A portal did indeed open and I was also able to portal back to the “Echo of a World” where I was still rewarded with a chest filled with goodies and the timeline continuation remained unbroken.
Apologies if this is intended, as it would kind of make sense since technically your minions did kick ass, but what are the minions without their master?! 