Hey there, let's tackle this mini-cart display issue in your Magento 2 multi-store setup. I’ve run into similar quirks before, so here’s a step-by-step breakdown of what to check and fix:

1. Verify Mini-Cart Data Source Configuration #

The mini-cart block (Magento\Checkout\Block\Cart\Sidebar) might be filtering items to only show those from the current store. Here’s how to adjust it:

• Check the getItems() method in the default block class—if it’s adding a store ID filter, you’ll need to override this block in your custom module.
• When rewriting getItems(), remove any store-specific filters to ensure it pulls all items from the shared cart, not just the current store’s.

2. Double-Check Cart Sharing Settings #

First, confirm your multi-store is set up to share carts across stores:

• Head to Magento Admin → Stores > Settings > Configuration > Sales > Checkout > Shopping Cart
• Make sure the Share Shopping Cart option is set to Yes (this works for stores under the same website).
• Also, check Stores > Settings > Configuration > General > Web > Session Management:
  • Set Cookie Domain to your root domain so cookies are shared across sub-stores.
  • Ensure Cookie Path is set to / to cover all subdirectories.

3. Clear Caches & Static Files #

Cached data often causes sync issues between stores:

• Run these commands via SSH:

  bin/magento cache:clean
  bin/magento cache:flush
  bin/magento setup:static-content:deploy -f
  

• Have your team test in incognito mode after clearing browser cache—this rules out local cookie/cache conflicts.

4. Inspect AJAX Response for Mini-Cart Updates #

The mini-cart uses AJAX to refresh content, so let’s check what data it’s getting:

• Open browser dev tools (F12) → Network tab.
• Add an item from each store, then trigger the mini-cart refresh. Look for requests like getSidebarCart.
• If the response only includes items from the current store, the backend endpoint needs adjustment to return all shared cart items instead of filtering by store ID.

5. Customize the Mini-Cart Template (If Needed) #

If the core block isn’t behaving, tweak the template to display all cart items:

• Copy the default template from vendor/magento/module-checkout/view/frontend/templates/cart/minicart.phtml to your theme directory:
  app/design/frontend/[YourThemeVendor]/[YourTheme]/Magento_Checkout/templates/cart/minicart.phtml
• Modify the item loop logic to iterate over the full cart item collection, removing any store-specific checks.

One last thing to rule out: Ensure product IDs are unique across your stores. Duplicate IDs could cause unexpected filtering, though this is rare in properly set up multi-store environments.

内容的提问来源于stack exchange，提问作者Ajay Jaiswal