ok for this you Breed A and B together, they beget C. The limitations now prevent A and C as well as B and C but if you take C and Breed it with D to beget E, A and E as well B and E are viable at this point. the code is apparently kind of wonky but that's the general gist of the limitations. because of the change one trait (Strange Bedfellows) was removed. I have not fully tried to mess with this but it definately is not just a removal of traits and words of the mechanic. Honestly it's not that big of a change.