No longer working with self contained: true

[garthtarr]

I'm using the latest dev version of quarto-cli. The fontawesome extension was working fine with self-contained: true but looks to have recently stopped working:

---
title: "Self contained true"
format: 
  html:
    self-contained: true
---

{{< fa thumbs-up >}}
{{< fa folder >}}
{{< fa chess-pawn >}}
{{< fa brands bluetooth >}}
{{< fa brands twitter size=2xl >}}
{{< fa brands github size=5x >}}
{{< fa battery-half size=Huge >}}
{{< fa envelope title="An envelope" >}}

Self-contained false still works fine:

[cderv]

This should be fixed in last prerelease. Please reopen if there is still something wrong