It's called being efficient rather than exploiting. The same mechanics have existed for mausoleum floor 5-6 since I can remember. If that isn't an exploit and nothing was done about it, then this isn't too. Solo partying/ghosting is allowed and it's not a bug. 99% of the time people who are even splitting maps come out with some undesirable loot (common-rare-epic) anyway. Just my two cents
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