I think the problem is your icon theme doesn't have a dedicated icon for workspace-switcher. Hence, it is using a weird icon. We can possibly solve this problem by copying the default icon theme's icon for workspace-switcher and pasting it into your current icon theme.
I think the problem is your icon theme doesn't have a dedicated icon for workspace-switcher. Hence, it is using a weird icon. We can possibly solve this problem by copying the default icon theme's icon for workspace-switcher and pasting it into your current icon theme.
Try the following command:
and
Hopefully, that will solve your problem.