422 Unprocessable Content when adding Bundle with Expand to cart

Retired Boards Appdev Bundles

Topic summary

Intermittent 422 Unprocessable Content errors when adding Shopify customized bundle products to cart. Storefront messages include: “All 0 {product name} are in your cart.” and “The {product name} cannot be added to cart.” In some cases the bundle is actually added (confirmed by Functions logs), but the UI returns an error.

Behavior and scope:

  • Not reliably reproducible; once triggered, persists for that product until /cart/clear, then works again.
  • Does not affect other items in the cart at the same time.
  • Occurs across themes (Dawn, Crave, Pipeline) and multiple merchants; also reproduced following Shopify’s tutorial.
  • Checkout may show “Inventory issues – bundled item is sold out.”

Attempts/workarounds:

  • Inventory adjustments and setting inventory policy to CONTINUE did not help.
  • Sample payloads and theme code (application/x-www-form-urlencoded POST to /cart/add.js) provided; code snippets are central for debugging.

Shopify status:

  • Acknowledged by staff; suspected link to a recent rollout.
  • Escalated from Functions team to Cart team; investigation ongoing, no fix or ETA shared.

Impact and state:

  • Blocks adding custom bundles in some live stores, affecting checkout migration timelines.
  • Issue remains unresolved; awaiting root cause and fix from Shopify.
Summarized with AI on December 11. AI used: gpt-5.
12

Hi @SBD

Thank you so much for your responses.
But we have also faced this issue from our merchants.

It feels like a bad excuse to tell that Shopify is looking into it. Haha!

It breaks down the merchant’s confidence as well when they get to know that it’s been 2 months so they might not get a fix for a long time.

Is there any update for this?