A simple workaround (that worked for me at least):
sudo apt install slick-greeter
printf '[Seat:*]\ngreeter-session=slick-greeter\n' | sudo tee -a
/etc/lightdm/lightdm.conf
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https://bugs.launchpad.net/bugs/1801609
Title:
Fails to deactivate dpms off mode after user initiated wake-up
events(not system-suspended, just locked and dpms active)
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