Okay thank you both for confirming... I was not freaking out btw, I was just confused and trying to make sense of the "missing" account activity.
That is indeed a pretty annoying feature and it's not something I've experienced yet with any of my previous transactions which (as far as I'm aware) have transitioned instantaneously from pending to posted.
Anyhow, thanks for explaining. I'll edit the title so as not to draw attention or unnecessary concern.