I was testing holding a barrier block last night in stream. the viewers could see the red x,s where they were in the world however when I was holding the block they only show up in one eye view.  as im wearing a windows 10 mixed reality head set I did not see the red x blocks on both eyes. only the left eye. the right eye saw the invisible blocks. this is was highly disorientating. when it was happening. 

 again I placed this under gear vr. as you dont have a section for windows 10 mixed reality vr. I could not screenshot or capture a video as my out put in mixed reality only shows the left eye not the right eye. please go test this and see for yourself.   

hold barrier block then place barrier block. you will see. 

this is a screenshot from the video of what my left eye would see. my right eye was just the world without the red x.