Empty Domain of Conflict

Ran all 5 enhanced emblems.
With about a minute left I died. Went back in and it's completely empty. No loot, no monsters. Just Divs Wasted.

Bug Report Number 1,487,362,055

Not a bug. This is intended, you have to be in the area when the loot drops or you will not get either loot or completion. This is the same for various other endgame encounters. If you die, you need to stay dead on the floor until all animations complete.

It had a minute left though; I took a while to go back in though due to loading screens so that might be it.

Regardless, I'd argue that if it is a feature, it's an objectively terrible one and should be treated as a bug.

Because, features do something, what does this do except annoy people and rob them of their loot for no good reason?

It's also not communicated at all in the game mechanics.
It's not communicated directly either.
It works differently to the rest of the game design and is generally unpleasant to experience.

My best guess is that it's a technical limitation from an older version of the game, which can be fixed now?

The 'pause instance' tech is in the game (see Ultimatum when choosing next round), so I imagine it wouldn't be too difficult to add it to the Conflict in case of disconnect or death. But GGG seems to have other priorities like PoE 2.