Handlebars special partial "@partial-block" gets reported as unknown global

Issue Summary

The handlebars template engine provides an internal, special partial called @partial-block, that can be used when calling a partial in "block style".

Instead of calling the partial regularly like {{> my-partial}}, it can be called in block form like

{{#> my-partial}}
  some fallback text
{{}/my-partial}

Inside the partial, the content passed inside the block can then be accessed using the special partial {{@partial-block}}. The feature itself works like expected inside of a ghost theme, the usage gets however reported as a theme error, specifically as "{{@partial-block}} is not a known global". This should not be the case.

Steps to Reproduce

put a partial with the content

<div>
fancy partial
  {{#if @partial-block}}
<article>
    {{> @partial-block}}
</article>
  {{/if}}
</div>

in a theme.

call it like

{{#> my-partial}}
this is a fallback text
{{/my-partial}}

check backend for theme errors

Ghost Version

5.75.1

Node.js Version

18.19.0

How did you install Ghost?

docker

Database type

MySQL 5.7

Browser & OS version

No response

Relevant log / error output

No response

Code of Conduct

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TryGhost / Ghost