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73416ba
(Get the code!)
I get the feeling that it has to do with monitor switch/resolution switch between sessions.
Example:
I use the work account at the office with 2 lowres screens via a thunderbolt dock.
When I'm done for the day, I lock the screen and put the computer to sleep.
When I arrive at home, I have some private tasks to do so I open my laptop without any dock and login on my private account. My laptop is Dell XPS13 with hires screen. It works fine. When I'm done I lock the screen and put the computer to sleep.
Back at work: I connect my computer to the dock with the two lowres screens and I login to the work account. I get the login screen again. My work session was killed.
TLDR;
Login to session 1 with 2 lowres screens.
Lock screen + sleep
Login to other session 2 with laptop screen (hires).
Lock screen + sleep
Login to session 1 with 2 lowres screens. Crash.