I did it three times last night, never once glitched.
I personally opened the door each time.
I stayed in the general area where the 3 hobgoblins spawn in the second wave.
I never went on the rocks other than to do a revive and jumped down immediately.
I never went to the lower area, killing floor, until after the third wave completion.
Didn't have an issue.
Seems to only affect when all three people are out of potential melee range.
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People seem to be mistaking the highest point as a cheese spot, the thing is Hobgoblins can kill you there, is it's not really a cheese spot, like the Nexus, there is a countermeasure if you want to stay in the cave entrance.
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The nexus isn't really a cheese spot seeing as hobgoblins and sekrion can still shoot you, and a minotaurc appears every 30 seconds. IMO it's just a second option/strategy. Stay up top and deal with the minotaur or go down and face the annoying harpies
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I didn't say cheese. I was thinking it might be an issue such as when people get on the rocks in phogoth and it spawns extra majors. So I made sure I was at least in a place where something could melee me if it walked up to me.