CartPlugin.php

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<?php
namespace Magento\Multishipping\Model\Cart\Controller;

class CartPlugin
{
    private $cartRepository;

    private $checkoutSession;

    private $addressRepository;

    public function __construct(
        \Magento\Quote\Api\CartRepositoryInterface $cartRepository,
        \Magento\Checkout\Model\Session $checkoutSession,
        \Magento\Customer\Api\AddressRepositoryInterface $addressRepository
    ) {
        $this->cartRepository = $cartRepository;
        $this->checkoutSession = $checkoutSession;
        $this->addressRepository = $addressRepository;
    }

    public function beforeDispatch(
        \Magento\Checkout\Controller\Cart $subject,
        \Magento\Framework\App\RequestInterface $request
    ) {
        $quote = $this->checkoutSession->getQuote();

        // Clear shipping addresses and item assignments after MultiShipping flow
        if ($quote->isMultipleShippingAddresses()) {
            foreach ($quote->getAllShippingAddresses() as $address) {
                $quote->removeAddress($address->getId());
            }

            $shippingAddress = $quote->getShippingAddress();
            $defaultShipping = $quote->getCustomer()->getDefaultShipping();
            if ($defaultShipping) {
                $defaultCustomerAddress = $this->addressRepository->getById(
                    $defaultShipping
                );
                $shippingAddress->importCustomerAddressData($defaultCustomerAddress);
            }
            $this->cartRepository->save($quote);
        }
    }
}