Theme app extension blocks not appearing consistently

Shopify Apps
1

Hello,

I’m developing a Shopify theme app extension (part of a Remix app), and I’ve run into an unusual issue:

  • For 5 days in a row, the theme extension stops working in the afternoon.

  • The issue is not just failed JS loads — the JS files are not injected at all into the page. They’re completely absent from DevTools > Network tab.

  • However, the rest of my app (e.g., Remix routes, discount APIs) continues to work fine.

  • If I switch to another theme during the broken period, everything works again — the JS files show up. Then, the next morning, the original theme works fine again without any code changes.

This suggests that:

  • Shopify is not injecting the app block assets during certain hours.

  • The issue might be related to Shopify’s CDN, asset build system, or stale app block references that fail silently.

I’ve verified this consistently across multiple days and themes. The behavior resets daily and is triggered without any deployment on my end.

Can you investigate this as a potential Shopify-side issue with how theme extension assets are built or injected?

Happy to share store access or screenshots/logs if needed.

Best regards,

3 Likes
2

For me it’s not working after changing theme.

3

We are experiencing this as well.. Our app blocks will show in the theme customization window but not in the live pages. Our scripts are not even being loaded by the Shopify CDN.