Blog Post Macro fails when used in the Default Welcome Message template

Summary

Using the Blog Post Macro fails when using it in the Default Welcome Message template.

Steps to Reproduce

1. Go to Confluence Admin
2. Choose Global Templates and Blueprints
3. Choose Edit next to Default Welcome Message
4. Add the Blog Post Macro
5. Save

Expected Results

The blog post macro displays as normal.

Actual Results

The Blog Post Macro does not render, and displays the following error:

$helper.renderConfluenceMacro("{blog-posts:space=@global|content=excerpts|max=5}")

There are no errors present in the logs.