UnoCSS version

66.5.1

Describe the bug

I noticed that the space- classes stopped applying spacing between children after I updated from 66.4.2 to 66.5.1.

<!-- This doesn't work -->
<div class="space-y-4 divide-y-2 divide-fuchsia-400">
  <p>Hello world!</p>
  <h2 class="text-2xl border-amber-600">Big text</h2>
  <p>Goodbye</p>
</div>

<div class="mt-8" />
  
<!-- This works -->
<div class="space-y-4 divide-y-2 divide-fuchsia-400">
  <div>Hello world!</div>
  <div class="text-2xl border-amber-600">Big text</div>
  <div>Goodbye</div>
</div>

It seems to be specific to non-div elements, but I’m not really sure. This same structure works in Tailwind4:
https://play.tailwindcss.com/2aea1fBPUR

Reproduction

https://unocss.dev/play/#html=DwEwlgbgBAxgNgQwM5ILwCIkAcEwKYC0AngQCxTgRgiEkBMFk1hAZgK4wAWSYCZADP3QA%2BAFBQowLMIASeOHAD2UAO6KATnBABCYAHpp4yZwbxkadABc8AD0sE6NuFABGGmuoIIAti7yeANkERACEwAHMoazt9EzEJKWEAcUVFEBciPH1DfUoxUVBIWEQUDG97AA50KD14qALKYvMMbFxaMkYqGmIHTuYCdi4ePlJgusKIWXklVQ0tXT08owmm0qtbe0dnN3UPL19-AiChYTDI6MtcyHG8lLSMrMXrgqfJoA&config=JYWwDg9gTgLgBAbwFBzgEwKYDNgDsMDCEuOA5gDQpxhQYDOGMAgjDFMAEYCuMwWAnpVQ16jAJIBjYnSHVaDGAHU8aACyUAvnCxQIIOAHIuuCBLp0DSJBgAekWOmwBDLgBt4mHPiIlgpABTIqFBu9ABccADaVKiRBhJcdDB6ALQhrhgG5IhwUq7QEQa0aAZwGgC6spVUdAAW0DAJMHQRQaiGCUmpdQ1NBoUwtjAprqRwgzbD0E64pBhw9QBuGFBhE8ODTq5ZVBqyIgotUTFyokoqqv4AlLLC8owsbJw8fPzXt6cKktKBJ6h0Ei2GAiAEYAHQAJg%2BqAkaFwhVqrDALQA9Cj6CAwXUUTt2mUblRqhorkggA&css=PQKgBA6gTglgLgUzAYwK4Gc4HsC2YDCAyoWABYJQIA0YAhgHYAmYcUD6AZllDhWOqgAOg7nAB0YAGLcwCAB60cggDYIAXGBDAAUKDBi0mXGADe2sGC704AWgDuCGAHNScDQFYADJ4Dc5sAACtMLKAJ5gggCMLPK2ABR2pPBIcsoAlH4WAEa0yADWTlBYqEw2yFjK3Bpw5LxxAOTllVDoYpSMYgAs3vUZ2gC%2BmsBAA&options=N4XyA

System Info

System:
  OS: macOS 15.6.1
  CPU: (16) arm64 Apple M3 Max
  Memory: 80.06 MB / 48.00 GB
  Shell: 5.9 - /bin/zsh
Browsers:
  Edge: 140.0.3485.66
  Safari: 18.6

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.