Minimal repro:

````
---
title: "Test of Reveal.js"
format: revealjs
---

## Here is a slide 
It's got some text on it.

::: {.content-visible when-format="html"}

## Title will only appear in HTML

:::

This text is confusing the machinery.

## Here is another slide 

It's got some text on it too
````
cscheid
2022-12-05T22:35:03Z
cscheid
bug revealjs
v1.3
closed
Conditional content confuses revealjs
https://github.com/quarto-dev/quarto-cli/issues/3575