How to exclude dynamic routes (optional catch-all segments)

[garabedium]

I'm using additionalPaths to generate sitemap URLs from a CMS. The CMS urls are generated as expected, but there are duplicate urls created from an optional catch-all segments route in my pages directory (ex: pages/[[...cmsPageSlug]].tsx).

Questions

1. Should next-sitemap dedupe the duplicate URLs? See "If your function returns a path that already exists, then it will simply be updated, duplication will not happen." in the docs.
2. Is it possible to exclude dynamic routes in the config? Excluding /[[...cmsPageSlug]].tsx (and a lot different variations) were not successful.

Next version: 12.3.4
next-sitemap: 4.2.3