Ivy honey setting like concrete in the brood frames — will my bees actually be able to eat it in January?

Yorkshire, first year, two colonies. The ivy on the churchyard wall has been humming for a fortnight and both hives have been piling it in. I cracked the crownboard on Sunday for a quick look and the outer combs of the top box have pale, almost chalky capped cells, and a couple of uncapped cells had gone solid enough that I couldn't flick the contents out with a matchstick. Everything I read says ivy honey granulates very fast because of the sugar mix in it. What I can't find a straight answer on is whether that's a problem for the bees. If it sets hard in the comb, can they still use it in the middle of winter when it's 2°C and they can't fly for water? Or do people end up with colonies that starve with full frames around them? Should I be doing anything now — leaving the syrup feeder on a bit longer so there's some softer store mixed in, or is that just me interfering with something the bees have handled for a few million years?