First-child on padding-top not work

[shiqocred]

What version of Tailwind CSS are you using?

For example: v2.0.4

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

Next.js 14.1.2

What version of Node.js are you using?

v20.0.0

What browser are you using?

Chrome

What operating system are you using?

macOS

Describe your issue

<div className="flex flex-col text-xs md:text-sm py-4 before:w-[1px] before:content-[''] before:absolute before:left-3 md:before:left-5 before:bg-gray-300 before:h-full before:top-0 relative z-0 first:pt-8 before:dark:bg-gray-700 last:pb-0">
   ...
</div>

first-child: is not work when i use on BubbleChat like

<div className="w-full">
     {chats.map((item) => (
        <BubbleChat key={item.id} {...item} />
      ))}
</div>

[wongjn]

Seems to be working in this Tailwind Play. Could you provide a fuller reproduction of when it doesn't work please?