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Ah ah tu as testé plus rapidement que moi, j'allais te dire qu'avec le thème classic que tout fonctionnait correctement.

Pour info j'ai utilisé ton hook : displayLinovCalculateur que j'ai rajouté au sein du thème classic dans le fichier : product-variants.tpl et cela fonctionne très bien.

{**
 * Copyright since 2007 PrestaShop SA and Contributors
 * PrestaShop is an International Registered Trademark & Property of PrestaShop SA
 *
 * NOTICE OF LICENSE
 *
 * This source file is subject to the Academic Free License 3.0 (AFL-3.0)
 * that is bundled with this package in the file LICENSE.md.
 * It is also available through the world-wide-web at this URL:
 * https://opensource.org/licenses/AFL-3.0
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to [email protected] so we can send you a copy immediately.
 *
 * DISCLAIMER
 *
 * Do not edit or add to this file if you wish to upgrade PrestaShop to newer
 * versions in the future. If you wish to customize PrestaShop for your
 * needs please refer to https://devdocs.prestashop.com/ for more information.
 *
 * @author    PrestaShop SA and Contributors <contact@prestashop.com>
 * @copyright Since 2007 PrestaShop SA and Contributors
 * @license   https://opensource.org/licenses/AFL-3.0 Academic Free License 3.0 (AFL-3.0)
 *}
<div class="product-variants js-product-variants">

  {hook h='displayLinovCalculateur' product=$product}
  {foreach from=$groups key=id_attribute_group item=group}
    {if !empty($group.attributes)}
    <div class="clearfix product-variants-item">
      <span class="control-label">{$group.name}{l s=': ' d='Shop.Theme.Catalog'}
          {foreach from=$group.attributes key=id_attribute item=group_attribute}
            {if $group_attribute.selected}{$group_attribute.name}{/if}
          {/foreach}
      </span>
      {if $group.group_type == 'select'}
        <select
          class="form-control form-control-select"
          id="group_{$id_attribute_group}"
          aria-label="{$group.name}"
          data-product-attribute="{$id_attribute_group}"
          name="group[{$id_attribute_group}]">
          {foreach from=$group.attributes key=id_attribute item=group_attribute}
            <option value="{$id_attribute}" title="{$group_attribute.name}"{if $group_attribute.selected} selected="selected"{/if}>{$group_attribute.name}</option>
          {/foreach}
        </select>
      {elseif $group.group_type == 'color'}
        <ul id="group_{$id_attribute_group}">
          {foreach from=$group.attributes key=id_attribute item=group_attribute}
            <li class="float-xs-left input-container">
              <label aria-label="{$group_attribute.name}">
                <input class="input-color" type="radio" data-product-attribute="{$id_attribute_group}" name="group[{$id_attribute_group}]" value="{$id_attribute}" title="{$group_attribute.name}"{if $group_attribute.selected} checked="checked"{/if}>
                <span
                  {if $group_attribute.texture}
                    class="color texture" style="background-image: url({$group_attribute.texture})"
                  {elseif $group_attribute.html_color_code}
                    class="color" style="background-color: {$group_attribute.html_color_code}"
                  {/if}
                ><span class="attribute-name sr-only">{$group_attribute.name}</span></span>
              </label>
            </li>
          {/foreach}
        </ul>
      {elseif $group.group_type == 'radio'}
        <ul id="group_{$id_attribute_group}">
          {foreach from=$group.attributes key=id_attribute item=group_attribute}
            <li class="input-container float-xs-left">
              <label>
                <input class="input-radio" type="radio" data-product-attribute="{$id_attribute_group}" name="group[{$id_attribute_group}]" value="{$id_attribute}" title="{$group_attribute.name}"{if $group_attribute.selected} checked="checked"{/if}>
                <span class="radio-label">{$group_attribute.name}</span>
              </label>
            </li>
          {/foreach}
        </ul>
      {/if}
    </div>
    {/if}
  {/foreach}
</div>

Et j'ai légèrement modifié le code de ton hook :

public function hookDisplayLinovCalculateur(array $params)
	{
		$idProduct = $params['product']->id ?? null;
    	$idProductAttribute = $params['product']->id_product_attribute ?? null;
		$ratio = null;
		$perte = 0;
		$displayPrice = null;
        
        if (null === $idProduct) {
            return;
        }
		
		if ($idProductAttribute >= 1) {
			// Produit avec déclinaisons : chercher dans linovcalculateur_attribute
			$sql = 'SELECT ratio, perte, active FROM ' . _DB_PREFIX_ . 'linovcalculateur_attribute WHERE id_product_attribute = ' . (int) $idProductAttribute;
			$result = Db::getInstance()->getRow($sql);
		} else {
			// Produit sans déclinaisons : chercher dans linovcalculateur_product
			$sql = 'SELECT ratio, perte, active FROM ' . _DB_PREFIX_ . 'linovcalculateur_product WHERE id_product = ' . (int) $idProduct;
			$result = Db::getInstance()->getRow($sql);
		}

		if ($result && (int) $result['active'] === 1) {
			$ratio = (int) $result['ratio'];
			$perte = (int) $result['perte'];
			if ($ratio !== null && $ratio > 0) {
				$priceTTC = Product::getPriceStatic($idProduct, true, $idProductAttribute, 6, null, false, true, 1, false, null, null, true);
				$displayPrice = $priceTTC / $ratio;
			}
			
			$this->context->smarty->assign([
				'ratio' => $ratio,
				'price' => $priceTTC,
				'perte' => $perte,
				'display_price' => $displayPrice !== null ? number_format($displayPrice, 2, ',', ' ') . '€' : null,
			]);

			return $this->display($this->_path, 'views/templates/front/calculator_product.tpl');
		}else{
			return $this->display($this->_path, 'views/templates/front/cart_product_basic.tpl');
		}