Static routes in pimcore not working for more than one parameter

I´d like to definie a static route in pimcore. This works find as long as the route does not have more than one parameter. As soon as I add a seconde one, I get the following error message:

You have requested a non-existent parameter "book/".

The resulting files looks like this:

pimcore:
    staticroutes:
        definitions:
            f4a7a318-1d29-4f58-8a3c-d204d33a207a:
                name: story
                pattern: '/\/stories\/(.*)\/(.*)/'
                reverse: /stories/%book/%title
                controller: 'App\Controller\DefaultController::storiesAction'
                variables: 'book,title'
                defaults: null
                siteId: {  }
                methods: null
                priority: 0
                creationDate: 1635722217
                modificationDate: 1635722280

Any ideas?

Thanks in advance

I fiddled around with that a bit and found a solution. In previous versions I was able to use reverse patterns like this: /stories/%book/%title where book and title are the variables. However, it seems that the logic has changed here a bit. The following works now: /stories/%%book/%%title