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I had a similar problem, not with the Wahoo, but on my road bike. There was a gap like yours and then the chain would of course hit the derailleur hanger.
It was incorrect mounting of the cassette. I had to slide it on and turn it until the teeth caught. Then you need to torque it down with a cassette tool to get it to slide all the way on the freehub. This was my issue and maybe it's the same here.
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