Symfony changed its "Directory Structure Best Practice for Reusable Bundles" in its 4.4 version.

In the old one, everything was just in the bundle root dir / (or maybe inside /src, in which case this was considered "root").
In the new one, the PHP classes moved inside /src and the contents of Resources are unpacked into the root / (with sometimes different names).

Below is a comparison of the old and the new structure:

/
├─ AcmeBlogBundle.php
├─ Controller/
├─ README.md
├─ LICENSE
├─ Resources/
│  ├─ config/
│  ├─ doc/
│  │  └─ index.rst
│  ├─ translations/
│  ├─ views/
│  └─ public/
└─ Tests/

/
├─ config/
├─ docs/
│  └─ index.md
├─ public/
├─ src/
│  ├─ Controller/
│  ├─ DependencyInjection/
│  └─ AcmeBlogBundle.php
├─ templates/
├─ tests/
├─ translations/
├─ LICENSE
└─ README.md

Pimcore doesn't support the new bundle structure at the moment, because it doesn't look at the new locations for Areabricks, config, templates and assets, which means:

• Areabricks are in /src/Document/Areabrick/ instead of /Document/Areabrick
• config is in /config instead of /Resources/config/
• templates are in /templates instead of Resources/views/
• assets are in /public instead of /Resources/public/

The solution is to look in both possible location, as Symfony does e.g. here, here, here or here.

Resolves #10912