Addons are not updated as part of the OS image so Kodi will need to start and then fetch updated addons. Until this has happened things will be a little non-functional. This is how Kodi works - it's nothing specific to LibreELEC. If after a while things have no self-updated there is either some kind of networking issue preventing access to our repo, or maybe something bad in the previous config and you'll need to provide a Kodi debug log for anyone to investigate further.