@utility won't generate some class names

[sn3h]

What version of Tailwind CSS are you using?
4.1.6

What build tool (or framework if it abstracts the build tool) are you using?
@tailwindcss/vite 4.1.6

What version of Node.js are you using?
Deno

@Utility accent-muted {
@apply
}

@Utility accent_muted {
@apply
}

@Utility header-1 {
@apply
}

will get generated, but

@Utility header_1 {
@apply
}

seems won't get generated.

Any reason for that?

[philipp-spiess]

Hey! Yeah seems like header_1 is not extracted:

We'll look into it, thanks!

[RobinMalfait]

Hey!

This has been fixed by #17961 and will be available in the next release.