Framework extras missing in backend

[mjauvin]

Winter CMS Build

dev-develop

PHP Version

8.1

Database engine

MySQL/MariaDB

Plugins installed

No response

Issue description

Trying to use a button in a backend view with a data-attach-loading does not work.

Note: this works fine on a frontend page

Steps to replicate

Add the following button to a backend controller:

<button data-attach-loading data-request=onAjax>TEST</button>

Workaround

No response

[mjauvin]

Note:data-request-flash does work in that same backend view.