I am seeing something the same. I am seeing dead smaller bees be brought out and sometimes the larger (darker) one will even fly off with them, but usually just leave them on the ground.
I just installed my NUC yesterday and so far today there are maybe a dozen on the ground that I’d say just died.
Here is a video I took of one of the times I watched a bigger bee haul a smaller one out from inside of the hive. This time the small dead one was left, but twice before I saw them flown out of my sight. Thoughts?
P.S. I did see around a 6-8 (maybe a dozen) drones in my hive when I installed the NUC yesterday.