What worked for me was to only pick up the one heroic treasure I already had, and then place it again.
Cheesy way, but it did work.
Not sure how about now, everything seems to be broken after the release of last update.
Did that like 10 times and didn’t work so I just rerolled the challenges and ALT+F4ed after seeing I didn’t get any more legendary ones
Apparently another bug in the already long list.
And yes, those challenges after reroll are completely random. I got three legendary ones in row before, but sometimes before I did not get any, more days in the row. 
Piankhi
6
I tried this twice with two different new treasures. Placing them with a left click attack within the radius. Didn’t work. Tried moving an old existing one, didn’t work. Now one of my knew ones is bugged and just says “Take”, but I can’t interact with it to place it correctly.
system
Closed
7
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