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VM snapshot size

I didn't get a response to my last question. I'll take a different approach and see if I have more luck,

I create an snapshot from a VM instance that has a 20GB file in the filesystem. That snapshot ends up being 20GB+ in size. OK; that's expected.

I launch a VM instance from that snapshot and delete the 20GB file. I create a snapshot from that instance. Shouldn't the new snapshot be roughly 20GB smaller than the first one? What I'm seeing is that the new snapshot is the same size as the first. If this is expected, how can I jettison that dead weight?