Hi Shopify Devs, I have a Theme App Extension that includes the following files: blocks/app-block.liquid blocks/app-embed.liquid blocks/shopify.theme.extension.toml Everything was working fine until today, but now deployment fails with the following validation errors: Version couldn’t …

Deployment failing for Theme App Extension with schema tags in Liquid files

Luke December 16, 2025, 2:05pm 2

Closing this

Topic		Replies	Views
Shopify Theme App Extension deploy fails with Liquid syntax error: Unknown tag 'schema' even though {% schema %} is valid Extensions theme-app-extension	3	154	December 16, 2025
Liquid Syntax Error: Unknown Tag ‘Schema' Extensions theme-app-extension	3	288	December 16, 2025
Liquid syntax error : Unknown tag 'schema' when running shopify app dev Shopify CLI and Libraries app-commands	182	3509	December 17, 2025
CLI 3.84.1+ Regression: "Unknown tag 'schema'" for app_block with require_remote_ui Shopify CLI and Libraries app-commands	4	361	December 16, 2025
Missing schema warning in snippets Extensions theme-app-extension	15	741	December 16, 2025