The page holds only the travel info plugin, whose default action required a travel info: opened without a slug or code it failed with "Required argument travelInfo is not set" (TYPO3 10 did the same). The argument is optional now and its absence gives the same 404 as an unknown slug or travel code (notFound(), shared with travelCodeAction). Co-Authored-By: Claude Opus 5.5 <[email protected]>