[ARM Stable Update] 2021-06-18 - Pacman 6, Plasma 5.22, PlaMo Gear 21.06, Firefox 89, Gnome 40.2 and Kernels

No, You don’t need to set the auto login at boot.

So, I test wayland without the auto login at boot, wayland is working.

on boot you have to select your graphic session, plasma wayland

graphic session with x11

[nln2@n2 ~]$ inxi -G
Graphics:  Device-1: meson-g12a-vpu driver: meson_drm v: kernel 
           Device-2: meson-g12a-mali driver: panfrost v: kernel 
           Device-3: meson-g12a-dw-hdmi driver: meson_dw_hdmi v: kernel 
           Display: x11 server: X.Org 1.20.11 driver: loaded: modesetting s-res: 1920x1080 
           Message: Unable to show advanced data. Required tool glxinfo missing. 
[nln2@n2 ~]$ 

graphic session with wayland

[nln2@n2 ~]$ inxi -G
Graphics:  Device-1: meson-g12a-vpu driver: meson_drm v: kernel 
           Device-2: meson-g12a-mali driver: panfrost v: kernel 
           Device-3: meson-g12a-dw-hdmi driver: meson_dw_hdmi v: kernel 
           Display: wayland server: X.Org 1.21.1.1 driver: loaded: modesetting s-res: 1920x1080 
           Message: Unable to show advanced data. Required tool glxinfo missing. 
[nln2@n2 ~]$ 

@JFL have a look here, I found my first test with wayland on the n2