There are quite a few ways for a site to distinguish private/incognito from normal browsing, and IMO these differences should be treated as bugs. Indeed, these

There are quite a few ways for a site to distinguish private/incognito from normal browsing, and IMO these differences should be treated as bugs. Indeed, these differences often break sites (including a vaccine registration site) that should work fine. We don't need even more ways for sites to break in private/incognito mode.