Embedded report adding an unwanted 10px top margin to my iframe

[MaxW]

Hi, 
I have embedded a report but can't seem to get it to fit the frame properly as there is a 10px top border. It is embedded with powerbi.js

When I embed it it the top of the report has an unwanted 10px margin which is filled with the report 'wallpaper'. The top bar is my webpage and the iframe is supposed to be seamless. The yellow line is the 10px margin that appears to be causing the problem. The line is yellow because I added a yellow 'wallpaper' in PBI desktop to prove that the line is within the iframe. How can I get rid of this margin? My report is exactly set to the frame size.

embedded render

 Offending MarginView in PBI desktopPBI desktop page settings

[MaxW]

I found a solution, but surely this is a bug.

The report renders correctly after embedding if I change the 'view' settings in PBI desktop to 'Fit to Page'.