Smart Cart V2 Performance Release - Native Cart Regression

A release to the Rebuy storefront SDK on 2026-05-11 introduced a regression for merchants who have the Rebuy app installed but do not have Smart Cart V2 active: clicks on their native Shopify cart icon stopped opening their theme's cart drawer.

Incident Report: Native Cart Regression Date: May 11, 2026

Duration: 9:36 AM – 12:50 PM ET (~3 hours 14 minutes)

Summary

On May 11, 2026, a subset of merchants experienced an issue where the cart icon on their storefront was unresponsive to shoppers. The issue was introduced as part of a scheduled SDK release and was fully resolved within 18 minutes of being identified.

Root Cause

A performance update to the Rebuy storefront SDK introduced a change that inadvertently interfered with native cart behavior for merchants who do not have Smart Cart V2 enabled. Merchants with Smart Cart V2 active were not affected.

Resolution

Once identified, we reverted the SDK release within 18 minutes. Native cart functionality was restored immediately upon revert.

What We're Doing

We are expanding our pre-release testing coverage to ensure that SDK changes are validated across all merchant configurations before reaching production — including merchants who may not have specific Rebuy features enabled. We are also reinforcing our internal review process to include configuration-specific test cases as a required step before any storefront SDK release. These changes will help us catch unintended side effects earlier in the development cycle and prevent a similar disruption from reaching your store.