We already know that multiple inheritance is bad. So I'm not surprised about the reported multiple inheritance Exporter bug. What I am surprised about is that this behavior still surprises people. Clearly more education is needed. So here's some education for you:
Multiple inheritance is wicked and wrong and you shouldn't use it!
It used to be the case that you might be able to make a weak argument for this abysmal practice. With roles, I'm hard-pressed to think of any excuses. Stop using multiple inheritance.
Given how many times I warn against absolute terms like "never" and "always," I'm on thin ice here.