Hi @hughconway ,
This will need many debugging steps, can I send you a collaborator invite? it will help me check things more clearly
Topic summary
Issue: A bundle display built with Liquid (Shopify’s templating language) and JavaScript updates correctly on variant change, but breaks when the bundle product is out of stock (because one or more bundled items are unavailable).
Evidence: One working example and one broken example URL were provided to illustrate the behavior.
Code context: The JS was referenced but not actually included in the thread (empty code block), limiting community debugging.
Collaboration steps: A helper requested collaborator access, asked for the collaborator code via private message; the OP initially couldn’t find PM options. They were directed to use the Messages icon or send details via the helper’s email.
Action taken: The helper advised editing product-options.liquid and inserting code at a specific location (instruction provided via a screenshot image, which is central to applying the fix).
Status: No confirmed resolution yet. Root cause not explicitly identified in-thread; changes to product-options.liquid are the current proposed fix, awaiting outcome.