[Windows 11] Taskbar is suddenly behind all windows

Not sure why this is happening, but as of last night, my taskbar is suddenly behind all windows. Previously if any window was hovered over the taskbar, such as an explorer window or browser window, it would end up behind the taskbar. But now all such windows are appearing in front of it, and the taskbar only appears in front if I click it.

This may not sound like a major issue, but the problem is that if any program is running in a borderless fullscreen mode, then the taskbar is permanently hidden so long as that program is running. What's worse, it also means that notifications I receive are also appearing behind different windows I have set up, so I can't see notifications for things like an alert coming in from programs like Steam or Discord.

So far I haven't been able to find any setting to change this back to normal. I have already tried the following:

1. Enabling and then disabling "Automatically hide taskbar."
2. Resetting the Windows Explorer program in the task manager.
3. Setting every window to fullscreen using the F11 key and then back to normal.
4. Making changes to the registry.

Nothing so far has worked. Is this an actual bug, or did Windows apply some update I wasn't aware of and now it can't be returned to its previous state?