Are you switching branches like there is no tomorrow ? Please don’t say you also switch between KDE-Git and the default KDE packages …
I noticed this in your journal
mai 21 17:35:58 mauricioquintela kstart5[2553]: Omitting both --window and --windowclass arguments is not recommended
that might be related to whatever this scrips/desktop files might do at startup
mai 21 17:32:53 mauricioquintela plasma_session[945]: org.kde.plasma.session: could not start "/home/mauricioquintela/.config/autostart/mathpix-snipping-tool.desktop" : "" ()
mai 21 17:32:53 mauricioquintela plasma_session[945]: org.kde.plasma.session: could not start "/home/mauricioquintela/.config/autostart/nvidia_pm.sh.desktop"
Anyway … Did you tried this?