We've updated the master and LE10 branches to the latest kernels with all video driver fixes available so far.
RPi4 nightly should be built soon, if you run LE10 please give this build a try (it also includes an update to latest kodi Matrix version):
https://www.horus.com/~hias/tmp/libreelec/LibreELEC-RPi4.arm-10.0-devel-20220115145917-70986b0.tar
so long,
Hias