Customizable Options in Cart Incorrectly Update All Instances of a Product

[Hurrpadurr]

Preconditions and environment

2.4.7-p2

Steps to reproduce

1. Create a simple product with at least 2 customizable options (both as dropdowns).
2. Add the product to the cart with the following selections:

• Dropdown 1: Value A
• Dropdown 2: Value C

3. Add the same product to the cart again but with different selections:

• Dropdown 1: Value B
• Dropdown 2: Value D

Note that both products are correctly added as separate items in the cart.

4. Go to the cart view.
5. Edit the customizable options of one of the products in the cart.

Expected result

Only the selected product in the cart should update its customizable options according to the changes made.

Actual result

Both products in the cart are updated to reflect the same customizable options as the product being edited, regardless of their previous settings.

Additional information

A workaround is to remove the affected product and re-add it with the correct options, but this is not an ideal solution.

Release note

No response

Triage and priority

• [ ] Severity: S0 - Affects critical data or functionality and leaves users without workaround.
• [ ] Severity: S1 - Affects critical data or functionality and forces users to employ a workaround.
• [X] Severity: S2 - Affects non-critical data or functionality and forces users to employ a workaround.
• [ ] Severity: S3 - Affects non-critical data or functionality and does not force users to employ a workaround.
• [ ] Severity: S4 - Affects aesthetics, professional look and feel, “quality” or “usability”.

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[engcom-Bravo]

Hi @Hurrpadurr,

Thanks for your reporting and collaboration.

We have verified the issue in Latest 2.4-develop instance and the issue is reproducible.Kindly refer the attached video.

https://github.com/user-attachments/assets/38cdb4d4-5b48-4140-91ad-a529bbdbb191

Both products in the cart are updated to reflect the same customizable options as the product being edited, regardless of their previous settings.

Hence Confirming the issue.

Thanks.

[github-jira-sync-bot]

:white_check_mark: Jira issue https://jira.corp.adobe.com/browse/AC-12846 is successfully created for this GitHub issue.

[m2-assistant[bot]]

:white_check_mark: Confirmed by @engcom-Bravo. Thank you for verifying the issue.
Issue Available: @engcom-Bravo, You will be automatically unassigned. Contributors/Maintainers can claim this issue to continue. To reclaim and continue work, reassign the ticket to yourself.

[Silarn]

From what I can tell, the \Magento\Quote\Model\Quote\Item\Compare::compare() function was modified to add a SKU check to the beginning of the function.

        if ($target->getSku() !== null && $target->getSku() === $compared->getSku()) {
            return true;
        }

This causes the function to return before the checks for custom options and such which should differentiate the quote items and not simply merge them.

I have no idea what this check was added to solve, but I'm going to test simply removing it in an override.

[Silarn]

I think the only situation I could see the above code being necessary is if somehow products sharing a SKU from different storefronts were added to the cart such that they would have different product IDs. I'm not sure what scenario would result in this.

I guess if you reworked it to run the compareOptions() checks IF the product IDs are identical. Then do the SKU check. But even in that case I think you'd want to check the custom options and not necessarily just merge the same-sku-different-id product. I think you'd only want to do that if the product(s) in question had no custom options.

As far as I know it shouldn't be possible for multiple products in one storefront to have the same SKU though, so this check does still seem unnecessary. Maybe I'm wrong.

[FilipDobrev]

Something that worked for me: I had a custom setting in the HandleCartAddAfter, and no matter if the custom setting was on or off the price was updated for all items in the cart. What fixed it was assigning the custom option in the HandleCartAddBefore. Hopefully this helps someone

[pmzandbergen]

Patch for the quote module:

--- Model/Quote/Item/Compare.php.org	2025-10-07 13:29:35
+++ Model/Quote/Item/Compare.php	2025-10-07 13:29:51
@@ -68,8 +68,8 @@
      */
     public function compare(Item $target, Item $compared)
     {
-        if ($target->getSku() !== null && $target->getSku() === $compared->getSku()) {
-            return true;
+        if ($target->getSku() !== null && $target->getSku() !== $compared->getSku()) {
+            return false;
         }
 
         if ($target->getProductId() != $compared->getProductId()) {

Using custom options does not necessarily means the SKU differs. For example if you have a custom text for adding a label on the packaging, this field does not alter the SKU. Hence we should compare the options even if the SKU's match.