fixes.php

Note: If you have the module ets_ordermanager, please check this file first
/modules/ets_ordermanager/views/PrestaShop/Admin/Sell/Order/Order/Blocks/View/product.html.twig
search:
{{ customization.value }}

replace:
{{ customization.value | raw }}

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Same if you have the module orderedit, the file to check is 
/modules/orderedit/views/PrestaShop/Admin/Sell/Order/Order/Blocks/View/product.html.twig

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Also if you have the module pms_admin_order, the file to check is 
/modules/pms_admin_order/views/Module/Admin/Sell/Order/Order/Blocks/View/product.html.twig

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/src/PrestaShopBundle/Resources/views/Admin/Sell/Order/Cart/Blocks/View/cart_summary.html.twig
search:
{{ customizationField.value }}

replace:
{{ customizationField.value | raw }}

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/src/PrestaShopBundle/Resources/views/Admin/Sell/Order/Order/Blocks/View/product.html.twig
search:
{{ customization.value }}

replace:
{{ customization.value | raw }}

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/mails/_partials/order_conf_product_list.tpl
search:
{$customization['customization_text']}

replace:
{$customization['customization_text'] nofilter}     

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/mails/en/order_conf_product_list.tpl
search:
{$customization['customization_text']}

replace:
{$customization['customization_text'] nofilter}