App Block Showing in Customize but not showing in Preview

Online Store and Theme Development
1

Short description of issue

App Block appears in Customize (theme editor) but does not show on any page in Preview or live store.

Reproduction steps

Open Online Store → Customize.

Add or view an App Block on any page (e.g., product).

The block displays correctly inside the editor.

Click Preview or view the live published site.

The App Block no longer appears.

Additional info

Affects all pages, not just one template.

App Embed is enabled in theme settings.

Tried clearing cache, publishing theme, and using different browsers.

Theme: QeRetail

App Block type: Price Calculator

Screenshot examples attached (Customize vs Preview).

What type of topic is this

Bug report

2

Hi there,

Just confirming first, are you the developer of the app block encountering this issue?

4

Yes, I’m the developer of the app block. However, this issue is happening on the merchant’s side — the block shows correctly in the Customize (theme editor) but doesn’t appear on Preview or the live site. I’m trying to understand if this might be related to theme rendering, app embed visibility, or a frontend loading issue.

5

Ok, we can help you investigate this but we’ll have to access the affected shop’s admin to investigate.

Can you please reach out directly to support through https://help.shopify.com/ so we can be authorized to do that?

Feel free to link to this Dev Forum post, and share any additional information that you think might help. For example, whether the issue only occurs on that theme, or whether it occurs on another theme such as Horizon as well :slight_smile: