I will try and disable display fusion and see what happens. If you cannot right-click on the icon, click on the Start menu and look for the same app. To do so, right-click on the invisible icon in the taskbar and select the 'Unpin from taskbar' option.

I have hibernation disabled, so shutdown would shutdown completely. A simple fix that has proved helpful is to unpin the icon first followed by adding it again. The only 3rd party program I am using in Display Fusion for managing my monitors. PeterX: if the icons were never on the task bar, then you can select them by right clicking a blank spot on the taskbar, selecting Taskbar settings. Right now the icons are gone, when I click on the arrow it scrolls 2 at a time through the icons also they randomly show up like the screenshot shows. I'm also curious what that arrow to the right is? It looks like it would give you the ability to scroll through your system tray icons, but I don't think I've ever seen that before. In your original post you said that the taskbar icons disappeared, but in the screenshot they are there but in what I can only describe as a broken state. So something that is affecting your system tray, which I believe is linked to the explorer.exe process, will possibly still be present after 'shutting down' the computer. Find out the Microsoft OneDrive, and switch the toggle ON. In Windows 11, expand the Taskbar Corner overflow panel to view all the icons that can appear on the system tray or taskbar.

In Windows 10, click on Select Which Icons appear on the Taskbar from the Notification Area. There was a gap between my icons so I right clicked it and it was microsoft word and theres no way to unpin it, it only gives me an option to pin and theres also another one when I right click gives me the option to close all windows. Go to Personalization > Taskbar to view all settings.

Bear in mind that a shutdown doesn't do a complete shutdown, it puts the computer in to a semi-hibernation state. So I installed windows 10 today and I found 'invisible icons' on the task bar.

Taskbar icons invisible windows 10