Nothing you describe is wrong
As I read your description you find a difference between live-fire and dry fire. This is correct and normal for the Model 12.
Surprisingly enough in live fire with a hand on the forend the gun works as a pump. Given the locked breach simulating recoil in which the gun moves backward by pushing the forend relative to the gun is appropriate for dryfire.
Dry firing will likely eventually fracture the firing pin retractor in the top of the bolt. There is a pin hole in the firing pin retractor that will act as a stress riser - there is an obvious risk to a broken firing pin retractor.
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