I ran into a problem starting in 8.0.1 where some of my remote buttons stopped working. After digging, I discovered that way that rc keymaps are specified completely changed between 8.0.0 and 8.0.1(!)
Read this for the new way of doing it: LibreELEC.tv/rc_maps.cfg.sample at master · LibreELEC/LibreELEC.tv · GitHub
After setting up my rc_maps.cfg to point to my old keymap, it started working again.