I checked all my hives two days ago and found water accumulation, and even some lids with black mold growing. Only one hive, which had retained a shim under the inner cover from placement in the summer, was dry. So, whether you are using a telescoping cover with a inner cover or a migratory cover, ventilation of the warm, moist air must be accommodated. After wiping the water off the lid undersides with a old towel, I placed small chunks of wood under the covers to prop them up. These I picked up off the ground from the abundant mulch, but you could use anything that would allow airflow.
Some beekeepers make a small shim, called a Imrie shim, to place under the inner cover or migratory cover. This would work well, too. But, the first step is to do the checking, so please be sure to get out there!