mailscanner doesn't create work dirs per "Run As User"

[Frank Cusack]

If the "Incoming Work Dir" and "Quarantine Dir" do not exist when
mailscanner starts up, it creates them but this apparently happens
before changing uid, as evidenced on my system by them being created
owned by root.  Mailscanner is then unable to create the subdirs
underneath as by the time it does THAT, it has changed to the Run As User.

Or am I doing something wrong?

4.78.17

-frank