Non-Angle-Bracket Block-Rendered Components Parsed Incorrectly in `0.7.0`

[alexlafroscia]

After updating to 0.7.0, some Markdown files that were previously parsed correctly no longer are.

We have a template like this:

## Simple Block Mode

{{#docs-demo as |demo|}}
  {{#demo.example name="fluid-select-simple-block-mode.hbs"}}
    {{#fluid-select
      select=(action (mut selectedFilter))
      options=filterOptions
      selected=selectedFilter
    as |select|}}
      {{select.trigger label="What kind of stuff?"}}

      {{#select.popup}}
        {{select.list}}
      {{/select.popup}}
    {{/fluid-select}}
  {{/demo.example}}
  {{demo.snippet "fluid-select-simple-block-mode.hbs"}}
{{/docs-demo}}

## Custom List

Rendering the fluid-select in this way was fine previously, but now fails; rendering it with non-angle-brackets in the "block" style messes with the way the rest of the file is parsed, so Custom List is no longer parsed as an h2.

If I convert the example code to use angle-bracket style invocation, the parsing seems to be fixed.

[RobbieTheWagner]

Hmm, I am not sure what the problem might be here.

[alexlafroscia]

Me neither 🤷 I tried narrowing it down but any time {{#fluid-select}} was rendered in that way, the parsing below that was thrown off.

Especially odd since the deployed Addon Docs docs for this addon uses the same syntax!

[RobbieTheWagner]

I'm guessing it would have to be somewhere in the compile-markdown file. I do see this comment talking about handlebars and formatting https://github.com/ember-learn/ember-cli-addon-docs/blob/master/addon/utils/compile-markdown.js#L172-L173

Any chance you would have some time to debug? I would be happy to pair on it next week as well.