BG custom value incorrect generation in next.js build

[senneclaeskens]

What version of Tailwind CSS are you using?

v4.0.17

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

Next.js 15.2.4

What version of Node.js are you using?

v22.12.0

What browser are you using?

Chrome

What operating system are you using?

Windows

Reproduction URL

Describe your issue

So I'm not sure if this is a tailwind or next issue.
When running next dev, this is the generated CSS:

All good.

Now when running next build & next start, we see the following:

Center gets replaced by 50% and the rem value is being ignored, which makes the CSS have an incorrect value.

[philipp-spiess]

Hey! This is unfortunately an upstream issue from lightningcss. Merging this into the existing GitHub issue but do check out the workaround here: #15897 (comment)