Flies /etc/gdm/custom.conf after reboot. How to set up autologin?

Question

Arch Linux

I open /etc/gdm/custom.conf and add two lines:

[daemon]
WaylandEnable=false
AutomaticLogin=anton
AutomaticLoginEnable=True

I save (I check it the same way). I reboot. Login screen again... I
open /etc/gdm/custom.conf and see that it is reset to default

[daemon]
WaylandEnable=false

Everything worked just a month ago. But after the next update, this file was reset to default and after a reboot it is reset again. How to fix?