Comment Position from rest API

[Jgafner]

Hi 

TL;DR
How to determine the location of a comment on a non changed line in PR ? 

More details: 

Since 7.0 BB support comments at any line in a changed file. When calling the comments or the activities end point with rest, the response include the comment position in Anchor or Comment Anchor. 
When the comment is on a changed line its position is exactly the location after the changes but if the comment is on a non changed line it looks like the position is prior the changes. For instance, if I added 3 lines (2,3,4) and I commented on line 7 the response in the rest will give line 4.

I am not sure if this is a bug and if not how to determine the real location from the response. 

Thanks