Beterbiev beat him in a way the way that Beterbiev beats everyone.
What I'm going off of is the Stevenson fight. It was a fight where Gvozdyk's workrate and stamina (and durability) carried him through, but he repeatedly ran into shots (granted, Stevenson was a very good counter puncher on his day) and showed himself to be very susceptible to bodywork when Stevenson decided to walk him down for stretches (a guy who has never loved the front foot and who by this fight was very old and low-volume). Stevenson is obviously a southpaw and a fair bit different than Canelo, so it's not a perfect comparison, but Gvozdyk's style of punching and tendencies on the backfoot played into Canelo's strengths, I think.
Of course, considering the size difference and Gvozdyk's quality, I wouldn't have a great deal of faith in Canelo beating him, but I see a guy like Bivol (and definitely Beterbiev) as causing more obvious issues on the face of it. Bivol because I think he's a little more comfortable on the backfoot and not so easy to counter, and Beterbiev because he, as is frequently mentioned, is a beast.