on magento 2.4.2 upgrade

`Uncaught TypeError: Cannot create property 'cart' on string '{"messages":1613612384,"company":1613612384,"customer":1613612384,"compare-products":1613612384,"requisition":1613612384,"last-ordered-items":1613612384,"cart":1613612384,"directory-data":1613612384,"captcha":1613612384,"wishlist":1613612384,"company_authorization":1613612384,"negotiable_quote":1613612384,"instant-purchase":1613612384,"loggedAsCustomer":1613612384,"multiplewishlist":1613612384,"purchase_order":1613612384,"persistent":1613612384,"review":1613612384,"recently_viewed_product":1613612384,"recently_compared_product":1613612384,"product_data_storage":1613612384,"paypal-billing-agreement":1613612384}laxlaxlaxlaxlaxlax'`