1

As per answerfrom Patrick Steenks there, when a related product is already in cart, it is not displayed in the related product block.

How to display it anyway?

1

You need to rewrite the method Mage_Catalog_Block_Product_List_Related::_prepareData and remove this

Mage::getResourceSingleton('checkout/cart')->addExcludeProductFilter($this->_itemCollection,
    Mage::getSingleton('checkout/session')->getQuoteId()
);

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