Reproduction link or steps

https://github.com/jackholden/tsdown-css-watch-issue

Reproduction steps:

1. I run npm run dev (tsdown --watch)
2. I import my CSS files with ?inline
3. LightningCSS then transforms @custom-media rules etc.
4. I make a change in the .ts file, all is well and updates.
5. I make a change in the .css file, nothing happens.

What is expected?

If the file is being imported into the .ts file, I expect that file to be added to the watch list.

What is actually happening?

The .css files don't appear to be being watched despite being imported in the .ts file.

Any additional comments?

No response