TYPO3 Core

The function bootFrontendController in RedirectService does the following:
$controller->calculateLinkVars($queryParams);
$controller->getConfigArray();

But should probably be in the other order because calculateLinkVars needs the config.

A test here when redirecting to a record with &L=3 in additionalParams:
$controller->calculateLinkVars($queryParams);
$controller->getConfigArray();
var_dump($controller->linkVars); // string(0) ""

When the order is switched:
$controller->calculateLinkVars($queryParams);
$controller->getConfigArray();
var_dump($controller->linkVars); // string(4) "&L=3"