That is actually a feature of any flat 4 due to the firing order. The firing order of a flat 4 must be both on one side then both on the other in order for it to be balanced. The 718 engine fires 1-3-2-4, where numbering from the front 1 and 3 are on the left. That order makes it perfectly balanced, better even than an inline 4. Anything else makes it horribly unbalanced.What I have noticed is that the motor sounds like it is missing at low RPM's, the car runs smooth so I know it isn't but it sounds that way. I've noticed WRX's sound the same way.
FWIW, my neighbor who owns an older Triumph motorcycle and a later BMW often comments how my Cayman sounds so good. It whooshes like a big monster V-8 because it pushes so much air even at idle. He used to love the sound of the Triumph GT-6 I sold to make room for the Cayman.