I've had the issue where Windows won't go to sleep since at least early November and it got to the point where I was manually forcing it to sleep, but running a sleep study for the past few days shows that it's actually waking after I force it to sleep.
In terms of suggestions that have worked for others;
-I don't have a Realtek device and my Intel network adapter isn't set to wake the computer, plus the link provided is from 2019 so it looks like it pre-dates the current bug
-I tried installing KB4568831 but Windows Update said the update is not applicable to my computer
MoUseCoreWorker.exe definitely seems to be the culprit and I don't doubt the issue has been introduced by yet another a buggy update.
I got burned pretty badly by an update back in April 2018 that repeatedly failed to install and killed my display driver in the process (so much fun digging up my old 19' Dell monitor every couple of weeks to again re-install the drivers for the 34' only for the update to try and fail again and again somehow screw up the driver) then following an update late last year my computer would repeatedly hang on the splash screen when waking up. So my confidence in Windows as a product is as low as it gets.
I just wish there was a way to incentivise Microsoft to lift it's game, it's completely unacceptable for an operating system to be this unreliable. QA across the Microsoft product range is pretty flaky these days (don't get me started on Power BI), so I think the issue is more organisational dysfunction than shift in focus away from Windows development.