I (and I assume many others) have been waiting for them to fix this after reporting in months ago. I was kind of hoping that it would be in the last update, but oh well, hopefully the next one. I will say that I didn't realize it was happening in expeditions though, I really only noticed it in message boards. If it does happen in the expedition, there hopefully are still enough enemies to fill the bar (as there is usually a good amount of extra).