Quarto Website: Hybrid Navigation without section landing page?

[r-cheologist]

Consider a header like so:

website:
  title: "Website"
  navbar:
    left:
      - text: "Section1"
        menu: 
          - Section1Content1.qmd
          - Section1Content2.qmd
      - Section2.qmd
      ...

This works as intended and gives a navbar entry "Section1", with menu access to "Section1Content*" WITHOUT a separate landing page for the section.

This scenario seems, however, incompatible with hybrid navigation as described in the docs.

website:
  title: "Website"
  navbar:
    left:
      - text: "Section1"
        menu: 
          - Section1Content1.qmd
          - Section1Content2.qmd
      - Section2.qmd
  sidebar:
    - title: "Section1"
      style: docked
      contents:
        - text: "Section1"
          contents: 
            - Section1Content1.qmd
            - Section1Content2.qmd

Intended here is a sidebar ONLY in the context of "Section1" and it's content, The rendered result, however displays it on the entire page starting with the top level.

Any insight into howto achieve hybrid navigation in the absence of section landing pages (or into what I'm doing wrong) is highly appreciated.