I have to do the lost sector normally to get the legendary version, I am standing here at the chest and no boss ever spawned in. I'm in a voice channel with another player who has the same issue. We Googled it and found one thread that said to walk back to the entrance and reenter the sector because it fixed it for them, well we have both done this strategy a handful of times and the boss still hasn't spawned, nor has thr additional enemies that should be in the boss room. We can't complete this lost sector in order to do the legendary version.