LibreOffice (and its predecessor OpenOffice) can be annoying if you close a window or it crashes without saving the document, and if something is wrong with the time-saved backup which causes recovery to fail. It seems to remember too well that a backup is present and keeps offering to restore every time you open the program, even when that's impossible.
Re-installing or upgrading LO won't help, nor will re-installing the OS if you back up and restore the folders containing your work, because the broken backups will still be there. What you need to do is hunt down and delete the backup files. You need to search for them in the folders where your main documents are stored, and if they're not there they might be in /tmp/ or a subdirectory thereof. Sorry, I can't remember; it's been a long time since it happened to me. You might be able to find out where they're stored by looking in the preferences for LO.
It's not a bug, though it might be the developers are too persistent in their efforts to prevent work being lost. It's not going to go away in the next version of LO. It's not going to be any different on another OS. It's the way LO works and you need to find the broken backups and remove them.