:| This may sound like a brush-off answer, but it's not. My presumption is that it's due to you still being in the break-in period (and I'm only assuming this is a new-from-factory car you have).
Mine was a 2017 tier-3 model (one level down from your tier, I think).

It used to leap forward all the time as if it were in Dynamic Mode instead of Normal Mode.
:shock: When I left it idling for a minute while I walked to open the garage, I'd hear it THRUM-ing, THRUM-ing, THRUMMING, like an breathless angry chained-up dragon or something, both tailpipes were leaving small puddles of water on the driveway, and I could FEEL the same rough thrumming in the whole car when I sat back in it. I became afraid to idle the car for any period of time at all.
But after 4 months (about 4000 miles), the car smooths out. It practically becomes TOO silent and obedient.

The Normal Mode behaves like a "Normal" mode now… ( :lol: though now I kind of miss the untamed aggressiveness the car had when it was still breaking-in).
The vibration and the tailpipe water when idling in my driveway has completely gone (though it will still SOUND like a revving tractor if I idle for many minutes).
I think many sporadic owners have reported a wide variety of harmless-but-queer quirks about the engine during the break-in---Jaguar (not the dealership, but JAGUAR customer assistance) seems to consider it the experience of your parts "mating together".
:| That break-in idling vibration made me nervous---thinking maybe the petrol station I'd chosen was giving me dirty fuel… or something is mis-tuned with the cylinders… or something's clogged and spitting out water through the exhaust.
Though I probably don't have to worry anymore, as a habit, I still avoid idling around in my driveway or parking lots for more than a minute. I'd hate to be wrong about the break-in period, and have that behavior return.