Markdown files without content miss custom frontmatter added via remark plugin

[jelmerdemaat]

Astro Info

Astro                    v5.1.1
Node                     v22.12.0
System                   macOS (arm64)
Package Manager          npm
Output                   static
Adapter                  none

If this issue only occurs in one browser, which browser is a problem?

No response

Describe the Bug

When using:

1. a content collection,
2. with markdown files,
3. which contain frontmatter data, but no actual content besides frontmatter
4. a custom remark plugin to add custom data

then the custom data is not present on the content entry when rendering it.

See the reproduction where the working example is a markdown file with content, and the broken example is a markdown file without content. Within the same content collection.

This has been discussed in Discord: https://discord.com/channels/830184174198718474/1318215008647122994

What's the expected result?

The expected result is to have the custom data that is added via the custom remark plugin available when rendering the content entry.

Link to Minimal Reproducible Example

https://stackblitz.com/edit/github-58srtbao?file=src%2Fpages%2F%5Bslug%5D.astro

Participation

• I am willing to submit a pull request for this issue.