Hey, so I was having the same issue for the blogs on my website (due to the categories and tags). The way I solved this was to add some javascript to inset the canonical link in the header, you can copy the code from here: https://luckynightstudio.com/blog/how-to-fix-non-canonical-url-error-from-shop-categories-on-squarespace
hopefully this helps, but if you have any questions let me know.