Class not extracted when only occurrence is first element of Slim attribute array

[markzalar]

What version of Tailwind CSS are you using?

v4.1.2

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

@tailwindcss/cli

What version of Node.js are you using?

v22.10.0

What browser are you using?

Chrome

What operating system are you using?

macOS 15

Reproduction URL

https://github.com/markzalar/tailwind-4.0.10-slim-first-in-array

Describe your issue

This issue started happening in tailwindcss 4.0.10

If the only occurrence of a class is the first element of a Slim attribute array, the class doesn't get extracted.

For example, if I have the following slim code

div[
  class=%w[bg-blue-500 w-10 h-10]
]
div[
  class=%w[w-10 bg-green-500 h-10]
]                

I would expect it to render as

but if that's the only instance of bg-blue-500 in the codebase it doesn't get extracted and the slim snippet above renders as

[RobinMalfait]

Hey!

This has been fixed by #17557 and will be available in the next release.

[markzalar]

Thanks, @RobinMalfait. Really appreciate it!