2018 Kia Optima EX (59,800 mi) with Rattle/Crackle Sound Upon Acceleration

I only notice the sound when accelerating at lower gears because I think it's easier to hear. It doesn't sputter or have any other unexpected performance issues, accelerates to speed just fine. No issues with transmission either.

Having said all this, I'm currently knocking on wood.

2018 Kia Optima EX 59,800 miles (mostly highway) Regular maintenance performed

Thanks for pointing me in the right direction!