🐛 Bug: All Contributors comments are valid and yet also trigger "I couldn't determine any contributions to add"

[JoshuaKGoldberg]

Bug Report Checklist

• I have tried restarting my IDE and the issue persists.
• I have pulled the latest main branch of the repository.
• I have searched for related issues and found none that matched my issue.

Expected

This repo should use https://github.com/JoshuaKGoldberg/all-contributors-auto-action to post All Contributors comments that work and are valid.

Actual

Comments create responses like #429 (comment) from the @allcontributors bot:

@JoshuaKGoldberg

I've put up a pull request to add @JoshuaKGoldberg! 🎉

I couldn't determine any contributions to add, did you specify any contributions? Please make sure to use valid contribution names.

Additional Info

Filing an issue on this repo to make sure I get to it as part of this repo's general stability initiatives. The root issue is tracked in all-contributors/app#468 <- JoshuaKGoldberg/all-contributors-auto-action#227.