Just finished updating my production machine here. Using KDE Plasma on Manjaro Mikah 20.1 with linux58 kernel. Same issue; plasmashell crashed upon reboot after updating. Followed the suggestion to remove eventcalendar and did systemctl reboot. Voila, plasmashell is working back as it should be. Loosing the Event Calendar is a bit of a bummer though. I used it quite frequently. I sure hope it’ll get fixed verily soon.
Still unable to scan or print using Canon all-in-one printer, regardless of series. And sometimes unable to print using HP Laserjets too. But, it’s not a big issue for the time being. Still had hopes though, that more printers and scanners will work with Manjaro straight out of the box, regardless of make.
Other than that, everything else seems to be working normal as usual. Thanks for the hard work @philm and team.