Astro 5.1.1: Cannot destructure property 'type' of 'lookupMap[collection]' as it is undefined

[shockch4rge]

Astro Info

Astro                    v5.1.1
Node                     v22.11.0
System                   macOS (arm64)
Package Manager          pnpm
Output                   static
Adapter                  none
Integrations             @astrojs/tailwind
                         @astrojs/mdx

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

No response

Describe the Bug

Collection references cannot be defined as an array in the content collection schema. Tested with the file loader; haven't seen results with the glob loader yet. Restart the server in the stackblitz and the error should show.

Submitted issue from my own findings and this reply here: #12616 (comment)

What's the expected result?

You should be able to define collection reference arrays, as seen in this example from the astro docs: https://docs.astro.build/en/guides/content-collections/#defining-collection-references

Link to Minimal Reproducible Example

https://stackblitz.com/edit/github-rzbnajjs?file=src%2Fcontent.config.ts

Participation

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

[ascorbic]

Hi. I can't reproduce it using your example. First it fails because it's referencing an invalid tag, but when I fix that it doesn't give an error. Can you check it and try again. Also ensure you're using 5.1.2 in your site.

[github-actions]

Hello @shockch4rge. Please provide a minimal reproduction using a GitHub repository or StackBlitz. Issues marked with needs repro will be closed if they have no activity within 3 days.

[shockch4rge]

Hi, I've updated to 5.1.2 and regenerated the .astro folder at the same time, and my issue seems to have gone away, but the 5.1.2 changelog doesn't seem to mention such a fix.