CatalogInventory.php

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<?php
namespace Magento\CatalogInventory\Model\Product\CopyConstructor;

class CatalogInventory implements \Magento\Catalog\Model\Product\CopyConstructorInterface
{
    protected $stockRegistry;

    public function __construct(
        \Magento\CatalogInventory\Api\StockRegistryInterface $stockRegistry
    ) {
        $this->stockRegistry = $stockRegistry;
    }

    public function build(\Magento\Catalog\Model\Product $product, \Magento\Catalog\Model\Product $duplicate)
    {
        $stockData = [
            'use_config_min_qty' => 1,
            'use_config_min_sale_qty' => 1,
            'use_config_max_sale_qty' => 1,
            'use_config_backorders' => 1,
            'use_config_notify_stock_qty' => 1,
        ];
        $currentStockItemDo = $this->stockRegistry->getStockItem(
            $product->getId(),
            $product->getStore()->getWebsiteId()
        );
        if ($currentStockItemDo->getItemId()) {
            $stockData += [
                'use_config_enable_qty_inc' => $currentStockItemDo->getUseConfigEnableQtyInc(),
                'enable_qty_increments' => $currentStockItemDo->getEnableQtyIncrements(),
                'use_config_qty_increments' => $currentStockItemDo->getUseConfigQtyIncrements(),
                'qty_increments' => $currentStockItemDo->getQtyIncrements(),
            ];
        }
        $duplicate->setStockData($stockData);
    }
}