Dying during boss fights is weird

Not sure if intended or a bug, but if char dies during a boss the whole map is empty and shadowed again and the layout changes. This just feels weird, as you can continue maps normally until up to the boss.

This is intended. At least for me game even says that if boss encounter is failed, the rest of the map content will be deleted.

Might be related to some mechanics on how the game works when map bosses, or bosses in general are reset.