`optimizeUniversalDefaults: true` breaks shadows

[alex-jitbit]

Reproduction URL

https://play.tailwindcss.com/JN9kLsgnWE

Describe your issue

Using optimizeUniversalDefaults: true adds css var overrides that remove shadows (when used in base layer)

[adamwathan]

Good catch! Fix here, just need to update a bunch of tests and tag a patch 👍

#14427

[adamwathan]

Merged the fix, will get a patch tagged today 👍