Yes, a change on my side do affect a reboot if no bl301 injection is found on the system.
The issue will be fixed in tomorrows nightly.
I am sorry for this inconvenience caused by 20200121 nightly.
Please all who have updated there boxes with this image follow boot2k3 guide.
If you have bl301 injected it should not make problems, just update also tomorrow to avoid issues.
Now the last nightly 20200116 got restored at https://relkai.coreelec.org/
If you have your device up and running with automatic update be sure you remove the downloaded CoreELEC-Amlogic-ng.arm-9.2-nightly_20200121.tar in the /storage/.update folder before rebooting the device!