Empty map instance after respawn

I died in my 3rd ritual in a map after having completed it by killing the boss. There was one breach left for me to do and one ritual. Resurrecting put me in what looks like a new, empty instance of that map, with 0 monsters remaining, and no chests, rubble, etc.. I respawned on top of the boss checkpoint, and could travel to the checkpoint where the initial portal was, but everything was unexplored with nothing left to do. Map was tier 3 magic.

Bug Report ID: #688214357

Had a similar issue with my map.

Willow map boss died to ED/Contagion after I died the first time in the map, so there were plenty of portals left. After respawning at the boss checkpoint, the map layout was completely different and was empty, so no drops from boss kill.

Same thing happened to me.

After killing the map boss, I died during an Expedition encounter. When I respawned, I was sent back to the boss checkpoint in an empty map (no loot on the ground and no monsters left).

Decay map, lvl 80, Corrupted Nexus