I have an app that reads data from a headless CMS. I want to use a webhook in the cms to revalidate the pages that has been changed when you publish them in the cms, however running revalidatePath on them doesn't seem to work at all. I have the following route: /[[...slug]] for all pages, so I run revalidatePath with /[[...slug]] but it doesn't work.

I also tried using revalidateTag, but as we're not using fetch I can't tag anything. I tried using unstable_cache, but as the cached data is recursive it can't stringify it, so taht's not possible either.

All pages have export const dynamic = 'error' and export const dynamicParams = false, so I feel like this may be related to that.
Either I am missunderstanding how revalidation works, or there's a bug in nextjs. Is there someone who knows what the problem might be?