Let me as well ask a question,
A Google search says that the average relative humidity is 65 % in refrigerators ... and the relative humidities of cream ganaches are above 80 % mostly.
So ... without vacuuming or without wrapping them with something ... wouldn't it be better choice to refrigerate the newly made ganaches while waiting to set ... than holding them at room temperatures overnight?
Would refrigeration have any adverse effect later on the shelf life or on structures, tastes etc. of cream ganaches ... other than drying a little bit?