POS receipt code editor: linter error blocks saving footer.liquid — even after reset to default

Extensions
1

I’m unable to save changes to footer.liquid in the POS printed receipt code editor. The Save button is permanently grayed out due to a linter error.

Error: expected "|" before filter, line:40, col:22

What I’ve tried:

  • Reset footer.liquid to the Shopify default template — the default code cannot be saved
  • Reproduced in Chrome Incognito with no extensions — same result
  • Other files (sales-receipt.liquid, header.liquid, line-items.liquid) save successfully with the same error visible in the preview panel
  • Replaced all instances of and not return with and return == nil across every file — error persisted
  • Searched every template file for not return — none remain
  • The error line number shifts depending on which file is selected (line:40 vs line:50), suggesting cross-file compilation

My theory: The linter misinterprets CSS var() references (e.g., var(--font-large)) as Liquid syntax. Files with {% raw %} wrappers around <style> blocks can save; footer.liquid’s CSS doesn’t use var() but gets blocked by the global error from other files.

Environment:

  • POS Pro, two locations
  • POS v11.3
  • Chrome on macOS

Has anyone else hit this? Is there an API endpoint to update POS receipt templates programmatically as a workaround?