For some reason, the final screen of the webUI installer on Rawhide says "To begin using Fedora 39 (Workstation Edition), reboot your system.", even though Rawhide is F40. I don't know where it would be getting '39' from. The top bar says "Fedora Linux 40 (Workstation Edition Prerelease) installation".
Sent PR upstream: https://github.com/rhinstaller/anaconda/pull/5147