Question: Internet Recovery Seems Missing Some System Files
I reinstalled MacOS from Internet Recovery. It seems to have some system files missing. I added a printer in System Preference and it's missing scanner tab, only printing function is available. I tried to Reset printing system and re-add the printer, but it's same result. I went to my wife's MBA, the printer/scanner was already added properly, but I Reset printing system and re-add the printer, both printer and scanner can be properly added. Both Mac are with the latest version of Catalina, 3 devices (2 Mac + the printer) are all on same home network, the printer is directly connected to my Time Capsule via Ethernet. Eventually I installed Brother's scanner driver and went through the entire process - it doesn't automatically pick up, had to Reset and re-add - it finally worked.
The other thing I noticed is some default Apps strangely jumped around, see the 2nd screenshot.
Also I used Shift+option+command+R to reinstall OS which means factory reset - I bought the 16" MBP in 2019, which was not on the latest Catalina - but the installation, after the spinning globe finished, was initiated from Recovery mode (got a screenshot from internet). This is strange, I recall it's supposed to be directly installing the OS. After installation finished I'm already on the latest version of Catalina, which means something during factory reset was not right.
Anyway, sorry for the long description... about why I chose to factory reset a half-year old machine? See this post: How to delete "SILICON MOTION INC." ?