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Howard
This has also defied the laws of physics / logic to me, as to do this you’re basically going to be very partially clamping the stem above the top of the steerer tube. Fine with a thick alu steerer, but with carbon?! No thanks!
The mantra of always having (at least) 5mm spacer above and below the steerer has repeatedly been a case for bike companies (I have no personal experience with Cannondale) rejecting warranty claims for cracked / damaged steerer tubes.