It sounds like an udev issue. But re-connecting displays works for me with USB-C. And Wayland has still very strange bugs, for example, on my workstation the login (powered by Wayland under Ubuntu) freezes upon selecting the user and again when entering a password until you move the mouse long enough in circles [0]. So somehow the user input treatment (and, secondary, rendering) is linked to the mouse input. If wayland can manage that, it can mess up on the xrandr layer equivalent and change the display enumeration.
