Rainboe:
I agree it doesn't sound right, but this is what PANS-OPS I-4-7-App-1 para 1.3 says about go-arounds from visual manoeuvring with prescribed track:
At the end of the visual manoeuvring track, a go-around procedure for a second prescribed track manoeuvring is provided. In some cases, the go-around procedure can join the instrument missed approach procedure.
(my italics). In other words they're saying it's not a go-around to fly the whole instrument procedure again, it's a go-around so you can re-attempt the visual manoeuvring component. If you were doing that it would make no sense to climb above circling MDA because you were down there in the first place in order to stay visual. May not be to everyone's taste, but it is what the book says.
I imagine the sort of scenario they're talking about is if, say, there's a runway incursion, or you're too high/too fast on final but still visual with the runway.
NS