I have a VGA Monitor extending my laptop display.
After this upgrade, when the laptop screen 'sleeps' to a black state, it does not wake up on mouse movement.
With the cursor on the VGA monitor, alt-F2 to bring up krunner.
Type konsole into krunner
Blindly type systemctl reboot
After re-boot, both screens are visible again.
Edit: I have not been able to reproduce this.