I've clicked Add Widgets in the panel context menu, and the "pager" widget there shows the number "2" in the corner (it was 1 before). Which I think means the number of pagers I have. But there is a pager neither on the panel nor on the desktop. I tried doubleclicking the widget in the "Add widgets" sidebar, which increased the number in the corner to "3" but still no pager appeared. I tried dragging and dropping the widget onto the panel, but this did nothing, didn't even increase the number in the corner.
Any hints?
KDE Plasma version: 5.5.5
Screenshot of the widget: