Sylius version affected: 1.3.0

Description
Overriding templates from Sylius bundles does not work.

Steps to reproduce
After I create a file under templates/bundles/SyliusShopBundle/Homepage/index.html.twig path and I change the content to blank, I still get the Sylius vendor's homepage index template rendered. The weird thing is that overriding templates from Twig bundle (exceptions) works fine.

Possible Solution
I think this might have something to do with the old templates structure, custom namespaces or theme loader for Sylius bundles.

Tip
If I remove the core template from vendor, then the custom template from templates/bundles/Homepage/index.html.twig is loaded. It seems like the vendor has a higher priority than the app.
Might seem obvious, but the bug was detected on Sylius-Standard and replicated in the PluginSkeleton.