scrollycoding example does not work with the next15

[qiushiyan]

I forked the starter project, after upgrading to the latest version of next 15 and @next/mdx 15.0.4, the parseRoot function in the scrollycoding page returns error

[ Server ] Error: Cannot read properties of undefined (reading 'A')

Moving content.md to a standalone page component renders ok. So I guess it has to do with how codehike processes it.

stackblitz link https://stackblitz.com/edit/github-5wcqn232?file=package.json

Commands I used to upgrade the project

npx @next/codemod@canary upgrade latest

npm install @mdx-js/loader@latest @mdx-js/react@latest @next/mdx@latest codehike@latest