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Applied that fix from the link adobe to

src/PrestashopBundle/Service/HookDispatcher.php 
/src/Adapter/LegacyHookSubscriber.php

Removed the If clause from src\PrestaShopBundle\Resources\views\Admin\Product\form.html.

The hook displayAdminProductsExtra still not loading it's content from the database. I'm not dev but still digging for solutions to this. 

Edit: Why is hidden ?

Applied the fix to

src/PrestashopBundle/Service/HookDispatcher.php 
/src/Adapter/LegacyHookSubscriber.php

Removed the If clause from src\PrestaShopBundle\Resources\views\Admin\Product\form.html.

The hook displayAdminProductsExtra still not loading it's content from the database. I'm not dev but still digging for solutions to this. 

Edit: Why is hidden ?