Hmmm I clicked Start, typed in Windows Tools, clicked it and it showed up all the icons fine.
I opened File Explorer and looked in "C:\ProgramData\Microsoft\Windows\Start Menu\Programs\" but Administrative Tools was not there.
In Windows 11, Adminstrative Tools is now called Windows Tools.
Try click Start and typing in Windows Tools then click on it. Do all icons show up?
If all icons still missing, try this link below that may help you to fix odd issue.
Do you want to open the Windows 10 Administrative Tools in Windows 11? Here is how to Open Windows Tools in Windows 11 and PIn it to taskbar
www.technospot.net