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I had the same problem and have solved by changing my id_shop in AttributeRepository.php.

When I installed my theme, it created one id_shop to each theme variation, and i have chosen the id_shop 6 to production. My ps_shop table has just one entry, with id_shop = 6.

When i debug the ProductController.php, i saw that $id_shop var was always null, and the function findByLangAndShop() was returning nothing. So, I edited the function in the file /src/PrestaShopBundle/Entity/Repository/AttributeRepository.php

I Changed:

->setParameters([
                'idShop' => $idShop,
                'idLang' => $idLang,
            ]);

to:

->setParameters([
                'idShop' => 6,
                'idLang' => $idLang,
            ]);

I think this is a bug in core prestashop files.