Sort of.
It's also a proper use of subversion (take notes, Johnson). Fans expected Tony and Cap to bury the hatchet early. Rather, Stark still resents Rogers and distances himself from the Avengers.
IMO it's not a mistake, because they're conveying the dissonance of the world (and universe) not only immediately, but ages after The Decimation. It's also makes the movie feel like a true sequel rather than "Infinity War Part II".
We shouldn't be focusing on the future implications of this event. That's why there was no credit scenes. Being concerned with Spider-Man's out-of-time repercussions makes no sense until Far From Home. It's likely explained then.