Theme Preview is broken

Shopify Apps
,

Topic summary

Main issue: Theme preview in a newly generated Shopify theme extension fails across Shopify CLI versions 3.69.4 and 3.70.0.

  • Setup: New project with a theme extension containing a single Liquid block (auto-generated 5‑star rating template). Liquid = Shopify’s templating language; CLI = command-line tool.
  • Symptoms: Preview shows broken styles/CSS, and the Liquid block is not embedded or rendered on the page.
  • Evidence: A screenshot is attached (central for visual context).
  • Scope: Reproduced on two CLI versions, suggesting it’s not a one-off local glitch.
  • Request: Seeking confirmation from others experiencing the same issue.
  • Status: No resolution or workaround yet; cause remains undetermined and the thread is open.
Summarized with AI on December 14. AI used: gpt-5.
1

Hello,

I’ve tried @Shopify_77 /cli 3.69.4 and 3.70.0. I’ve generated a new project and a theme extension with a single Liquid block.

Liquid block is a standard 5star rating template that is automatically generated from the CLI.

The theme preview has (a) broken styles and (b) does not even seem to embed my liquid block on the page.

I’ve attached the screenshot of the page. Has anyone encountered anything similar?