Does not work with Astra Pro’s Color Switcher

Everything seems to work well until I started using Astra Pro’s “Color Switcher” to implement “dark mode.” With “WP Super Cache” activated, my Color Switcher site appears unable to correctly “remember” whether the user has switched to the “normal” or “dark” mode. (E.g., load a webpage, toggle Color Switcher, navigate away to a different page on the same site, toggle Color Switcher again, then come back to the initial webpage … the page will load with the unexpected color palette; clearing browser cache and reloading/refreshing webpages in the browser do not help.) The issue goes away and “Color Switcher” works as expected as soon as I deactivated “WP Super Cache.”