The episode technically wasn’t meant to be the last word when it was crafted, but the wise writers still set things up without any cliffhangers or major plot threads left hanging, on the off-chance that Disney would indeed pull the plug, which it eventually did after months of indecision.
So it’s within the realm of understanding that Harvey’s goodbye scene would have gotten cut for time in an episode full of last moments.
Though Girl Meets World’s tentatively final episode was a couple of minutes longer than the average installment, a lot of moving parts had to be shown in motion in order to deliver proper closure to the diehard fanbase.