Selecting text on write only sends the first letter to the primary clipboard

Same error in LibreOffice (and only LibreOffice) 6.5, 7.0.3, and 7.0.4 on Debian 10 running KDE Plasma Dekstop 5.14.5, when I select a line or block of text in Writer, only the first character is sent to the primary clipboard with all the rest not included. If I copy, the whole selection is added to the clipboard correctly.

I want to avoid having to manually copy, as to not have to go back and forth between keyboard and mouse for a repetitive task. Is there anything I can check to see where the problem originates from? It only happens on LO, all other programs, gtk, gnome, kde and others send the whole selection to the primary clipboard upon selection.