Cart discount generate no longer running

Extensions
1

Hey team – I can no longer get my development environment to work properly after upgrading the shopify CLI to 85. The exact same code that is running in my production store/app, now no longer triggers the discount path in my local environment / dev app. They are the same code with separate config files. Suddenly stopped firing yesterday afternoon.

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The function is registered:

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Ive tried:

  • Blowing away dev environment to clean up all artifacts
  • Resetting my config
  • Downgrading the cli to 84.1
  • Deleting the extension, deploy, add back, deploy
  • Uninstalling / reinstalling
  • Reconfiguring discount
  • Updating to 2025-07

Basically everything I can think of and the function just no longer triggers as it did before. Im quite lost as to what to try next here. Everything else about the app continues to work fine except the cart function where my discounts are applied to the overall order. Never see any logs when tailing the funciton in the console either or in shopify watch. Also of note that now sometimes my app just no longer works in my development environment where the buttons in my theme extension just lock up until I uninstall/reinstall the app which I have never experienced before.

2

Working in prod:

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Not working in dev:

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3 
The preview function also runs fine:       Output           

{“operations”: [{“orderDiscountsAdd”: {“candidates”: [{“message”: “$7 OFF ORDER (700 XP)”,“targets”: [{“orderSubtotal”: {“excludedCartLineIds”: }}],“value”: {“fixedAmount”: {“amount”: “7”}}}],“selectionStrategy”: “FIRST”}}]}

Input.json file:

{
“cart”: {
“cost”: {
“subtotalAmount”: {
“amount”: “100.00”,
“currencyCode”: “USD”
},
“totalAmount”: {
“amount”: “100.00”,
“currencyCode”: “USD”
}
},
“lines”: [
{
“id”: “gid://shopify/CartLine/1”,
“cost”: {
“subtotalAmount”: {
“amount”: “100.00”
}
},
“merchandise”: {
“__typename”: “ProductVariant”,
“product”: {
“inAnyCollection”: true,
“inCollections”:
}
}
}
],
“deliveryGroups”: [
{
“id”: “gid://shopify/CartDeliveryGroup/1”
}
],
“attribute”: {
“value”: “760”
}
},
“discount”: {
“discountClasses”: [“ORDER”],
“metafield”: {
“value”: “{"orderXPRate": 100, "cartLineXPRate": 100, "shippingXPRate": 100, "collectionIds": }”
}
},
“localization”: {
“country”: {
“isoCode”: “US”
}
}
}

let me know if theres any other details I can add here.

4

Also tried creating a completely new App called Dev V2 and still have the same problem.

5

Have you tried using shopify app dev and seeing if there any errors or runs when that is active?
Shopify now keeps any dev versions of code running after dev command is finished running so might be the issue. You can see it here Test apps locally

6

Im using app dev the whole time, yes

7

It should be noted that every time I deploy – it locks up the rest of my extension. None of my theme UI continues to be interactive which has absolutely nothing to do with the function. What I believe is that something is bad with my bundled App and Im getting no errors anywhere to surface what is wrong and everything runs fine for the most part after it unfreezes.

8

Could you try a different development store? :thinking: