Previous to 0.45 patch, we have been able to empty the 60 round 556 clip and have a stack of 60 .556 rounds to put into the ammo box for storage. That was a very useful function. So far as I could tell, by design.
Since the patch, when emptying that 60 round clip, only 30 bullets come out of the clip. The other 30 disappear into thin air. This is very frustrating. I am sure it will be addressed shortly.