I have tried to get the quest a second and third time on alternate characters and when I open the chest I get nothing. Sorry if this has already been reported.
Update: Going to try this week with another key to see if patch fixed this issue. Also got the thorn quest for a third time has not duplicated. This would appear to be the only outlier.
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Seconded. I tried again this morning. Killed the servitor, went to the box with the star over it: naught but a blue gun engram. Will try again tonight with my 3rd character and save images.