Dying in a map after killing the boss wipes all map content

It seems that if you kill a map boss and continue doing other content in the map, and then you die, the map is reseted and regenerated with no mobs or content in it.

This has happened several times now, and in different maps. Often the death has happened during a ritual encounter. Last time was in Hidden Grotto: I killed the boss, and went to clear rituals. I died in one ritual, respawned next to the boss (which just died, parts of him were flying around) and noticed that the map had no mobs and the layout was different.

Once the bug was different, and even though the map was regenerated with 0 mobs or other content, the boss (which I already had killed once) was back alive and I could kill her again. This happened in Mire (I wrote another post about that earlier).