Breaking: #69148 - Backend Module Dispatching removed¶
See Issue #69148
Dispatching Backend modules through custom dispatchers have been removed. The corresponding Extbase functionality called “ModuleRunner” and its Interface have been removed as well.
Any dispatcher registered via
$TBE_MODULES['_dispatcher'] is not evaluated anymore.
All TYPO3 Instances with an extension that registers a custom backend module dispatcher.
Use a custom RequestHandler.