I have required xprofile fields in my Buddypress setup. They appear on the registration form displayed by the Membership plugin but they are not validated when I submit the form.
I.e. when I register as a new user I can successfully submit the registration form without filling out required Buddypress xprofile fields that are displayed on the form.
I'm using Membership 3 RC 2
The particular subscription I'm testing is a free subscription