We checked in the fly and didn’t reproduce your issue.
NoMachine service 8.4.2 -> do you have the Free Edition installed or something else?
If I connect directly to the computer everything works just fine.
Do you mean if you connect with NoMachine to the physical desktop everything works fine? Please clarify this point.
When I access the computer through NoMachine from a Windows NoMachine client
Are you connecting to a virtual desktop? Can you submit screenshots or a recording from session start to the point where you reproduce the problem.