with my Canary build as default OS: if I uninstall the Intel UHD Graphics driver in Canary it reverts to the Microsoft Basic Display Adapter. With that I get a normal blue boot menu. Windows Update then installs the Intel driver and it returns to being pink/distorted.
My RTM 23H2 has exactly the same driver installed, the boot menu is normal with 23H2 as the default OS. Something in 24H2 has changed and doesn't work properly with the Intel drivers on the boot menu (I've already tried several different driver versions). Windows itself has no problems with any of the drivers, though.