after Cinnamon restart, Workspace Switcher shows all windows on second monitor in every workspace, no matter what I do

[MuhMuhGH]

I have a laptop with a second monitor attached. The laptop display is the primary display.
Cinnamon had to be restarted for some reason. It opened a window telling me so, and I complied. After that, the Workspace Switcher now displays any windows in the second monitor in all of the workspaces instead of just one. If I move a window to the laptop monitor, that window is only shown in its appropriate workspace.
I rebooted the system, but it didn't help. I removed Workspace Switcher from the panel and put it back again, but that didn't fix it, either.
Also, when I right-click in a window's title bar on the second monitor, the menu does not list the workspace options at all. On the laptop monitor, it does.
I suspect this is a Cinnamon problem rather than a Workspace Switcher problem.

Does anyone know how to fix this?

I am running:
Kernel: 6.8.0-51-generic arch: x86_64 bits: 64 compiler: gcc v: 13.3.0 clocksource: tsc
Desktop: Cinnamon v: 6.2.9 tk: GTK v: 3.24.41 wm: Muffin v: 6.2.0 vt: 7 dm: LightDM v: 1.30.0
Distro: Linux Mint 22 Wilma base: Ubuntu 24.04 noble

The laptop is an older unit running an Intel Core i3 with 4 gigs of Ram.

[Jopp-gh]

Cinnamon had to be restarted for some reason

Cinnamon seems to have problems with the way how you connect to your 2nd monitor.
Crashes happen with cinnamon plugins, like extensions, applets, desklets.

Did you check the workspaces pane in Mint's settings?