Having now run the master sector a few times (solo and flassless) all that is dropping is a blue legendary engram from the chest and a blue helmet from the general run. Bungie states IF SOLO - exotic etc (Common). There is nothing Common if it does not drop one.
Very happy to understand what I am doing wrong, apart from continuing to rerun the sector over and over again!
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You’re not doing anything wrong, you’re just unlucky.