Breaking: #72474 - RequestHandler only works with Routes ¶
See Issue #72474
The default backend RequestHandler had a fallback that triggered the backend initialization without having
request parameter set. This was used for the transition when deprecating the traditional entry-scripts. The
logic has been removed.
Any regular backend request (non-module and non-AJAX) will now require a
request parameter, otherwise will fallback to the default route
(login) when not provided.
For all backend-related calls, either use a custom RequestHandler or switch to Backend Routing.