Hello and welcome to our forums,
I've done some research on this matter (as I was not aware of this) and it looks like this is the normal behavior (based on this
StackOverflow thread).
Unfortunately, I am not aware of any method in which this can be achieved (i.e. getting such information from within an application that runs under the SYSTEM account). However, from what I could see, there are some provided solutions in the above linked thread.
Hope this helps somehow!
Best regards,
Catalin