Last night in a bounty run, I quickly had to return to town because my inventory was full, and when I portaled back to my group, I saw that a legendary had dropped in an area where my group had cleared without me on my mini-map. I did not think to check the Tab map to see if it would appear there. I would hate to miss out on a Legendary drop, but also hate to hold up my group while I comb through any areas they already hit!
If someone can confirm that this icon would appear on the larger map that appears when holding the TAB key on my keyboard from their experience, I would be very grateful!