I confirm that I also had NeoChat installed. In the meantime I reinstalled my system … let’s say that it was the opportunity to clean it up. 
Thanks
I also solved… don’t know why but I had discover-snap installed instead of the distro official one. Removing it, solved my problem too!
I followed the discussion carefully, marked the message as a solution and put a heart etc… I also continued to comment on the discussion even if I had made the choice to rebuild my system. I think I did the job.
(This is before your message)
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My apologies, our letters must have crossed each other while being processed by the mail system…
For me downgrading to kio 5.78 (which I had locally) fixed it. Otherwise I couldn’t start lookandfeeltool to change the theme as it gave the same undefined symbol error and also was getting a cannot open display error in the tty.
I’m now in the DE but cannot change SDDM theme (from Maia) through the settings manager (I can’t embed the print screen) Error loading QML file.
Doing pacman -S kcoreaddons kdbusaddons kwindowsystem kcodecs kconfig kirigami2 kquickimageeditor knotifications ki18n worked as neochat-git brought it’s whole suite of these guys from git 
Now everything works fine with kio 5.80.1-1 
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… my error looks now:
… with this i get my normal login-screen back, can login, but now i have a black screen !!!
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ktrip-git from the offical repo caused the same problem for me, I additionally had to replace kcontacts-git.
So pacman -S kcoreaddons kdbusaddons kwindowsystem kcodecs kconfig kirigami2 kquickimageeditor knotifications ki18n kcontacts
solved it.
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