MapStaticAssets returns empty files when used with <Content Link=... />

### Is there an existing issue for this?

- [x] I have searched the existing issues

### Describe the bug

When adding assets to the `wwwroot` folder using ``, they are correctly fingerprinted and recognized through `@Assets`, but they return blank content:

This does work correctly after publishing

### Expected Behavior

Assets added through `` are fingerprinted and the correct content is returned

### Steps To Reproduce

Repro added here:
https://github.com/TomGathercole/contentlinkrepro

* Run `dotnet new blazor -ai -int Auto`
* Add a new css file outside of wwwroot
* Add a `` inside wwwroot, and add the styles to `App.razor` using `@Assets` syntax

### Exceptions (if any)

_No response_

### .NET Version

_No response_

### Anything else?

_No response_