My brother-in-law had submitted only front and last page of passport and never got additional page request....and this was in 2019 so we cant say they definitely will ask for or will not.....I have two more relatives of mine whose parents joined them in 2018 and 2019, I will share what they submitted too......All pages of parent's passports are must. CIC will ask for it . My friend missed 2 pages on his dad's passport, they asked for it and he sent it later. no need to panic.