How to publish a dashboard for specific users in specific roles?

I want to publish a new dashboard for specific users only, in specific roles. So far, I have created a new custom center tab, and in audience I only included the users that should see it in a Group. However, this way, even though when publishing the dashboard made in that tab I select only a specific role, the tab still appears for all the roles (with the same center) of the selected user. I want to avoid this. If I select a group and role in the center tab's Audience, the conditions are joined as OR instead of AND.