Hey, Just a quick pointer if someone finds this report while searching for a solution for the similar problem.
This problem also manifested on all of my machines. They were all running testing with Xfce + lightdm. Network manager didn't work, mounting (via gui) didn't work, even shutting down was not possible unless I did it via root account @ terminal. It turned out that systemd-shim was the culprit here. Removing it caused systemd-sysv to be installed making systemd the "real" init system (pid 1). After a reboot everything was back to normal and working as intended. System-shim seems to have serveral related bugs already submitted against it [1]. Regards, T. [1] https://bugs.debian.org/cgi-bin/pkgreport.cgi?repeatmerged=no&src=systemd-shim
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