How to display Commerce Order Owner role in Views fields? Using Drupal 7.58 and Views 3.18

I am simply trying to display Commerce Order Owner role on a View. Using the Commerce Order:Owner relationship, I have access to a large set of user fields and properties... except the User role? Did I miss anything here?

EDIT : I am using Aggregation on my View (if you want to replicate this issue)

EDIT#2 : interesting workaround here, simply add the user role field before activate the aggregation... Still, I could not manage to build a chart and only a list of roles counted per user, using Table with aggregation options display



Related question : How to add the &quot;user role field&quot; in View showing users
No clue why it's not showing. The Views module defines a "User: Roles" field, and I see that just fine in my own development environment for a View joining to Users via the "Commerce Order: Owner" relationship.