I reported a bug on 1.0 Around 1,5 year ago when 9 people party was fixed. It still works nowadays(atleast 5 months ago) but i cant explain 100 % thats why i dont report it anymore, but i will try to explain.
Its like when u have 8 people farming, and last person joins party sometimes full drop goes to him. Thats the key to start. Try to leave with any character and join with random one. And that random will get the next drop. And if u change again some other people in party with random ones, last joined will get the drop. Thats why we were doing relogins in random parties and joining with some cameras for short time or smth. Maybe its not 100% but the chance to get item is big. And i think its because of last two joined has 50%. Because of this GoD client with max 7 people in party. Last time when we were explaining it eeveryone laughed hard, but when some guys gets 4 times in a row drop everyone calls him extra lucky ^^ first i called it luck but its not luck because too much coincidence.
All in all i still cant explain how it starts to work. But second part is pretty clear, when it starts, the ones who sit in party very long has way lower chance to drop something or maybe even 0.
P.S. my all three weapon drops were done like this(Paagrio axe, demon stuff and aoba). Abusing bug? Nah, its just rng and pure luck. everything above totall bullshit?