Magento – Show Same Product as Separate in Cart

You should implement the sim card as related product instead of custom option.

Somewhere in Magento 2 code is the answer :

/**
* We need to reload product in this place, because products
* with the same id may have different sets of order attributes.
*/

It means that when I used this function two times:

$_product = $this->_productRepository->get($productSku);

the product was 'cached' and served a second time, and not re-loaded!

We then need to use $forceReload = true:

function get($sku, $editMode = false, $storeId = null, $forceReload = false);

:

$_product = $this->_productRepository->get($productSku, false, $storeId, true);