Base declarations are duplicated when !* is a class candidate

[bradlc]

What version of Tailwind CSS are you using?

v2.2.2

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

CLI

What version of Node.js are you using?

v15.14.0

What browser are you using?

N/A

What operating system are you using?

macOS 11.2.3

Reproduction repository

https://github.com/bradlc/tailwind-base-bug

Describe your issue

When !* is discovered in purge content as a class candidate it causes base styles to be duplicated (but with !important added)