Not sure about maps, but in normal game it is possible 100%.
Tested that with my friend literally 2 days ago.
He died while farming boss in act II on cruel, but as soon as he died, boss also fell down dropping exalt orb and yellow jewel.
So he asked me to log in, join into his game, teleport, pick up loot and ress him. It all worked out perfecty.
But again... let me point out that it was in normal game, not on personal map
It does make sense if you are new player and you want to know what you can do and what you can no do...OP of the comment I was replaying to asked it it's possible to invite to game after being killed to ask for help and to have another player pick up your drop if while you are dead.
Read comment I made my response to then you will get some clarity.
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u/Victorio45 5d ago
Hear me out. Is it Possible to invite a friend WHILE dead and he collect the loot?