[Theme: Pinnacle] Portfolio pages are not found

I’ve been trying to use the portfolio pages with the Pinnacle theme and once I updated to 1.3.1 they stopped working.

Now, any portfolio on a page, when I try to navigate to it, cannot be found.

Any ideas on how I can get my portfolios to work again?

Thanks!

(Example: https://www.stephencharlesweiss.com/recommended-reading/books/ ;
https://www.stephencharlesweiss.com/portfolio/recent-favorites/ )