UnoCSS version

66.5.6

Describe the bug

When I used presetWind4, I found that I couldn't partially override the defined css variable, but it was normal under presetWind3.

use presetWind4

use presetWind3

Reproduction

https://unocss.dev/play/#html=DwEwlgbgBAxgNgQwM5ILwCIBGBzAtABwCcwBbBQgTyiTAC8BTXARgAYoTn0A%2BYAenAhcAUKEixEKDABcAFvRKMAHtyFQoo6PGRoseIqXJUaDZmw5NufAcKuQuQA&config=JYWwDg9gTgLgBAbwFBzgEwKYDNgDsMDCEuOA5gDQpxhQYDOGMAgjDFMAEYCuMwWAnpVQ16jAJIBjYnSHVaDGAHU8aACyUAvnCxQIIOAHIuuCBLp0DSJBgAekWOmwBDLgBt4mHPiIlgpABTIqDAAFhggGABciFSoUq7QdNFBqKk0oE5Q-NEGAG6Z-gC0hekgmfwAlJapcBpUGrIiCklwANqxcqJKKqr%2BFbLC8owsbJw8fPx9A50KktKBHah0Ek6uUXAAjAB0AEzTcWi4OSGsYEkA9Of0IFt0IecG0xr9VAC6mhVIQA&css=PQKgBA6gTglgLgUzAYwK4Gc4HsC2YDCAyoWABYJQIA0YAhgHYAmYcUD6AZllDhWOqgAOg7nAB0YAGLcwCAB60cggDYIAXGBDAAUKDBi0mXGADe2sGC704AWgDuCGAHNScDQFYADJ4Dc5sAACtMLKAJ5gggCMLPK2ABR2pPBIcsoAlH4WAEa0yADWTlBYqEw2yFjK3Bpw5LxxAOTllVDoYpSMYgAs3vUZ2gC%2BmjpqRVhwpv42NoKwOLRQoRpYecrIpHGeYgBMnu5gnvt9FmI1CLw2chMWFlMzMHMLSytrG2IAnFtb%2B4eZYP0DQA&options=N4XyA

System Info

No response

Validations

• Read the Contributing Guidelines.
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• Check that this is a concrete bug. For Q&A open a GitHub Discussion or join our Discord Chat Server.
• The provided reproduction is a minimal reproducible example of the bug.