The template is creating a new comment for every commit to a given PR due to the change in the <!-- __NEXTJS_BUNDLE_ --> comment here:
https://github.com/hashicorp/nextjs-bundle-analysis/blame/main/compare.js#L197
The comment now includes the unique package name, which is not indicated in the template:
https://github.com/hashicorp/nextjs-bundle-analysis/blob/main/template.yml#L113