That's the fault of the application developers, not SPAs in general. SPAs support routing, for instance if you are using React router it uses the browser's history API to add the navigated pages to the history and to change the path that appears for the users, if a user then bookmarks that page when they reopen it react router and co should take him back to the same area of the app they were in before.

Not defending SPAs, just pointing out that they are not to blame for this.