I have a broken sudo currently, which is not a huge issue as I can just use a different TTY as root.
But when going back to TTY2, I am not logged in there. Running sddm as root works and I get into my current session, but causes issues with kwallet and PAM (I suppose).
On Fedora, TTY1 (I think) is used for the graphical login, and switching to it, enables the graphical view.
Nixos 25.05 unstable, KDE Plasma Wayland, SDDM Wayland
The default is tty7, not tty2. The configuration will let sddm start on additional ttys, so yeah, if you switch to 2 and log in again there you will end up with a second session.
7 is the traditional tty for graphical sessions, though some distros and display managers have indeed started defaulting to 1 or 2. sddm upstream also has configuration for 7, and switching to a different one would take some effort.