Decimal / fractional space (padding, margin) units like px-2.5, py-3.5 doesn't work in v4

[dicash]

We used to have fractional/decimal classes like py-3.5 in tailwind v4. (I believe they were part of tailwind v3, we didn't define them in config).
With update to v4 they don't work anymore.
I noticed py-1.5 works, but py-2.5 doesn't.
Is there something wrong with our (default) setup or tailwind deliberately dropped these values?
How to define these values in @theme?
We do

@theme {
  --spacing-1\.5: 0.375rem;
  --spacing-2\.5: 0.625rem;
  --spacing-3\.5: 0.875rem;
  --spacing-1-5: 0.375rem;
  --spacing-2-5: 0.625rem;
  --spacing-3-5: 0.875rem;
}

and it doesn't work.
Please help

[wongjn]

2.5 and 3.5 should work out-of-the-box as per this Tailwind Play. This indicates that it is most likely a problem in the project. Consider providing git repo reproduction if you'd like any further debugging assistance.

[dicash]

I suspect the reason can be because of including tailwind from external project (design system).
We have a monorepo with main app and ui-kit in different folder/package with its own tailwindcss setup. So when we run main app it doesn't see classed from ui-kit components.

[dicash]

Ok, we had to define

@source '../../ui-kit';
@import '../../ui-kit/global.css';