What version of Tailwind CSS are you using?

v4.0.12

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

@tailwindcss/cli

What version of Node.js are you using?

v23.9.0

What browser are you using?

N/A

What operating system are you using?

macOS 15.3.1

Reproduction URL

https://github.com/Fustrate/tailwind-4.0.12-haml

Describe your issue

Since 4.0.10, classes in HAML files haven't been detected properly. Out of 19 tailwind class names in the HAML file, only 6 seem to be detected:

I believe this is along the same lines as #16998 and #16975