Thank you everyone for your contributions, and I want to apologize to all of you for disappearing, but I was really busy at work and I completely forgot I made this post in the first place.
Good news is that somehow the latest manjaro update fixed the issue and libreoffice now works properly. On the other hand the same update made my panel/dock invisible, so I had to create a new post on the KDE section of this forum, but that’s another story.
once again, thank you all!