Shutdown without logon button - the saga continues.

It's the only issue I have at the moment with W11 !
It's minor I know, just irritating. Must-not-let-Microsoft-beat-me.
At the login screen I'm missing the Shutdown button.
It IS there if I logout though. Every time.
I checked the registry in safe mode and the setting is still there.
I disabled 3rd party apps and it's still missing on boot, so a Windows app is changing it on startup.
Question is, which one.
I could start disabling groups of apps/services at a time to narrow it down but that's just going to cause grief and errors or worse.
The registry value gets changed from a DWord to a string, which is interesting.
If the DWord is 1 then it's enabled, 0 = disabled, so a string is undefined?
How do I find which app is responsible. Registry monitoring via Sysinternals Procmon etc didn't offer anything.
Given that the value is "ShutdownWithoutLogon", I could scan every file in a system image (using an image to ensure files aren't locked and inaccessible) to find that string and the culprit and at worst edit the file and modify /delete the string.
I'm grudgingly considering a 23H2 factory recovery install and reinstall everything again, but that's a serious pain.
Maybe an inplace upgrade, but I don't have high hopes there.
Any ideas?

I don't get it, it works as written

regedit

Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System

shutdownwithoutlogon REG_DWORD 1

Computer users are members of the BUILTIN\Users group and have the privilege to shut down the computer. Unless you have changed something.

Interesting. In forty-four years of owning many dozens of computers, this is something I've never thought about before, or apparently even wanted to do. So, I'll watch the thread and see what you guys come up with.