tailwind upgrade doesn't explain what failed during the migration of js to css config

[lifeiscontent]

What version of Tailwind CSS are you using?

For example: v4.0.0

What build tool (or framework if it abstracts the build tool) are you using?

For example: postcss-cli 8.3.1, Next.js 10.0.9, webpack 5.28.0

What version of Node.js are you using?

For example: v22.x

What browser are you using?

For example: Chrome, Safari, or N/A

What operating system are you using?

For example: macOS, Windows

Reproduction URL

https://gist.github.com/lifeiscontent/860943b535af0fa846967a613b668c6b

A reproduction is required when filing an issue — any issue opened without a reproduction will be closed and you'll be asked to create a new issue that includes a reproduction. We're a small team and we can't keep up with the volume of issues we receive if we need to reproduce each issue from scratch ourselves.

Describe your issue

when using npx @tailwindcss/upgrade it fails to migrate to a css config but doesn't explain why it failed