That’s not to say that we won’t see a totally different Chewbacca in the Han Solo movie.
That isn’t to say that Han and Chewbacca won’t be butting heads throughout the movie.
The duo has always bickered, and I imagine it was even worse in the very beginning of their relationship.
In the original novels, Han Solo saved Chewie from certain death and torture, which is why the Wookie follows the nerf herder around the galaxy; he owes him a debt of gratitude and intends to pay.