The chances of being denied entrance on an e-visa correctly completed is virtually nil.
So no worries on your flight etc.
In the super remote chance denial of an e-visa: you still fly in visa-exempt anyway. So you still come.
More of a problem is people not getting the e- visa before flying in, so due to timing, they come in visa exempt and the E-VISA doesn't t Get used at all.
And getting denied an e-visa has NO effect on entering visa exempt, they are not connected.