For the death of the player, it didn't really automatically load back. I had to manually press the load back to checkpoint button. But Idk this might be intentional design hahaha!
As for the lava, I don't think I was actually attacked before falling in lava. I think it was at the part where I had to use the jetpack to get across a wall of some sort, but I ran out of jetpack fuel, so I decided to jump on lava lol.