I don't quite understand the question but it sounds like you are seeing dead bees with they heads in the comb? This is often an indication that the bees starved. If the bees are alive and head in I have heard the foraging bees often sleep in this position.
Being larvae I agree it isn't likely starvation but I wouldn't rule out starvation if they where adult bees; even if it isn't spring; I've seen dearths with large hives that wasn't brining in nectar and starved; not common but possible. You didn't mention the condition of the comb; pollen, nectar, etc.
That said; are there any indications of disease that you can tell? Odor? Does the larvae appear normal? Is it possible the larvae was chilled during a cold night?
Any images; that might help to see the condition of the comb and what the larvae looks like?
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