To be fair, I wouldn't read too much into the assist numbers because Leverkusen are hardly blessed with clinical finishers. I mean, Havertz was top their scorer in 2019/20 with 12 league goals!
If it makes you feel any better, he created 59 chances in the 2019/20 Bundesliga season, which is the 9th highest. To put that into context, Sancho created only 10 more chances (69) and the highest is 84 by Muller and he plays for Bayern.