This is absolutely the case. In PA anything related to hunting is considered hunting so therefore it is technically illegal to track after dark. Now tracking after dark they usually don't enforce unless they want to.
Here is the definition of hunting.
Hunt" or "hunting." Any act or furtherance of the taking or killing of any game or wildlife, or any part or product thereof, and includes, but is not limited to, chasing, tracking, calling, pursuing, lying in wait, trapping, shooting at, including shooting at a game or wildlife facsimile, or wounding with any weapon or implement, or using any personal property, including dogs, or the property of others, of any nature, in furtherance of any of these purposes, or aiding, abetting or conspiring with another person in that purpose.