"Failed to render app block" issue with app extension

Shopify Apps

Topic summary

App extension app block fails to render on a specific Shopify store during app approval review. The theme outputs only an HTML comment: “Failed to render app block “b47eb8c8-e7c4-4304-a937-39e690774c89”: app block path “shopify://apps/my-app-name/blocks/my-block-na me/da3e1b2c-1041-4679-9e32-2cddc3f298e5” does not exist.”

Reproduction and context:

  • Reviewer’s screencast shows the merchant removed the app block, saved, then re-added it, still loading the latest published extension version, yet the error persists.
  • The developer logged into the same store and observed the same HTML comment.
  • Issue cannot be reproduced on other stores.

Request and assets:

  • Seeking troubleshooting ideas or similar experiences; app and IDs redacted for privacy.
  • A screencast is attached and central to understanding the behavior.

Status:

  • No resolution or clear cause identified; discussion remains open with unanswered questions about why the app block path is reported as non-existent on that store only.
Summarized with AI on January 26. AI used: gpt-5.
1

Hello,

I am currently working on getting my application approved, however during the approval process I was sent a screencast showing that the app extension is not loading on the store.

When I logged onto the store in question and checked to see if I could replicate the issue, I’m seeing a comment in the HTML where the app block is supposed to render that says, “Failed to render app block “b47eb8c8-e7c4-4304-a937-39e690774c89”: app block path “shopify://apps/my-app-name/blocks/my-block-name/da3e1b2c-1041-4679-9e32-2cddc3f298e5” does not exist”. Nothing else is loaded except for that HTML comment. They even deleted the app block, saved, and added it again in the screencast so it should be loading the latest published app extension version.

I’m not able to replicate this issue in any other stores, and I have never seen this before. Has anyone come across this or has any ideas for troubleshooting? Please see attached screencast. IDs and app name have been redacted for privacy.

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