I extracted a number of frames this weekend (first time) a set the wet frames out for the bees to clean up. I was surprised to see that the bees chewed up the comb on a couple of frames while cleaning it. In some cases they ate furrows into the comb and in one spot they just cleared away most of the wax leaving a thin veil of comb. These combs were drawn on wax foundation. So, is that normal behavior (chewing up some of the comb) and will they just repair it next year when I put it back on the hive?