What's wrong with TrustedInstaller?

Question

Windows

Hello. I sometimes notice activity on my machine: the TrustedInstaller.exe file hangs in the task manager and does something.
I climbed to look at it: it lies in C:\Windows\servicing and... it doesn't have a digital signature!
And this seems strange to me. I looked at another car, it's exactly the same.
Judging by the location - the system file. How can he be unsigned?
Screenshot of file properties: https://s.mail.ru/KkcD/QtXrdhm5v
I don't see the usual "Digital Signatures" tab.
True, I don’t see it in some regedit either.
But in browsers, it (the signature) is everywhere. And in the files of kaspersky there is.
There are already two questions:
1. Is it intended that there is no signature?
2. What is TrustedInstaller.exe anyway?

Answer 1

I have a similar explorer displays.
If viewed through the inspect executable file in Process Hacker, it says that there is a digital signature.