dying on map boss resets the whole map

Is this a feature?
I have lives left on the map yet dying on a map boss resets the whole map, fog of war, loot gone, no mobs left.
If i die somewhere else, it is okay, but the boss.

Honestly, I wonder about this too. I understand that the boss HP has to reset and the way they do it is by resetting the whole map, which works in the campaign as each map can be accessed whenever without using any items (waypoints), but I don't think that is how it should work in the atlas (end game/mapping) when a waypoint is used and you also have lives per waypoint. Campaign and Maps just feel like playing 2 separate games.

It's intended because some people were abusing it dying on purpose to redo the content on the map or something.

Not too sure how and what but if you're afraid to die at boss you should clear the map first.