Hello, sorry to Necro this thread, but here's what worked for me. Win 11 22h2
Go to HKEY_CURRENT_USER\Control Panel\NotifyIconSettings in registry.
there will be a bunch of directories/Keys below it.
Manually go through each one (you can press the down button on your keyboard) carefully paying attention to the ExecutablePath (will show you where and give you a great idea what it is) and InitialTooltip (another good idea what it is), and if you are certain you know what it is or does then you can do what you wish
If you're unsure of what it is or what it does your choice is at your own risk.
This completely cured my problem. I had a couple of uninstalled applications that were still visible in the Other System Tray Icons section. I was successful in removing the registry entries. But, yes, you must be cautious about what you delete.