Update with https://chewitt.libreelec.tv/testing/LibreE…_64-12.80.2.tar and check/test again. I've enabled some more kernel modules; I'm intentionally doing them in bits to see which ones make a difference (or not). Also share the URL generated by "pastekodi" (run from the SSH console) after updating so I can see the system log.
Information on IR remotes is here: https://wiki.libreelec.tv/configuration/ir-remotes but an RC6/MCE remote should basically work out of box. Worst case you might need to swap some buttons around via XML maps. If you have some other kind of remote you'll need to create a toml keymap (not hard to do).
I'd advise against Amlogic purchases due to no LE support on anything recent. RPi5 is nice. Mine just has some standoffs fitted to the board with plastic bits top/bottom to give some basic protection. It sits in a cupboard out of sight though so appearance and protection aren't important, and I use a BT remote so line-of-sight with an IR remote isn't required (CEC is disabled in the AVR as I have too many CEC capable devices connected and this only causes problems).