profiles: What should happen with partial renders?

From an exchange in our internal Slack

to me it’s simply wrong doing but here is an example:

$ quarto create project website
_quarto.yml
project:
  type: website

website:
  title: "demo"
  announcement: 
    icon: info-circle
    dismissable: true
    content: "**Alert** - this is some information that you should pay attention to"
    type: primary
  navbar:
    left:
      - text: Home
        href: index.html
      - text: About
        href: about.html
    right:
      - about.qmd
      - icon: github
        href: https://github.com/
      - icon: twitter
        href: https://twitter.com/
format:
  html:
    theme:
      - cosmo
      - brand
    css: styles.css
_quarto-preview.yml
project:
  type: website

website:
  title: "demo"
  announcement: 
    icon: info-circle
    dismissable: true
    content: "**Preview** "
    type: danger
  navbar:
    left:
      - text: Home
        href: index.html
format:
  html:
    theme:
      - vapor
      - brand
    css: styles.css

Then:

quarto render

quarto render index.qmd --profile preview

You get a “working” website.

You don’t get the “preview” navigation, the styling and the announcement bar.