I'm not seeing this issue here.
Post a log from the working 20250720-47e72e0 nightly (ssh in, run pastekodi and post the URL), then remove quiet from /flash/cmdline.txt, update to 20250722-633559d and post a picture of what you get on the TV/monitor.
so long,
Hias
I tried it as you described.
But after the update, the same thing happened – the system won't boot and the screen remains blank.
I also confirm that with the latest nightly build
https://test.libreelec.tv/13.0/RPi/RPi4/…-1fdcbbd.img.gz, a new installation is possible again.