OK, it was there previously in 12.3.2280 ‘Wake up the system to start the scan (if in sleep mode)’ and ‘Shut down the system after the scan finishes.’

I don’t know if this is an omission or intentional, if so, presumably it would wake up by default. But given what you said it isn’t waking up to run the scan, so is it an omission or a bug.

EDIT: I have reported this to see if avast can resolve this.