Since TYPO3 9.2 initialization of backend routes has been moved to a PSR-15 middleware and is thus not done by Bootstrap::init() anymore as called by TestSystem::includeAndStartCoreBootstrap().
Due to this functional tests which rely on initialized routes will fail.
The testing framework should generally initialize the backend routes manually similarly to the v91 compat layer.
Since TYPO3 9.2 initialization of backend routes has been moved to a PSR-15 middleware and is thus not done by
Bootstrap::init()anymore as called byTestSystem::includeAndStartCoreBootstrap().Due to this functional tests which rely on initialized routes will fail.
The testing framework should generally initialize the backend routes manually similarly to the v91 compat layer.