It is possible to change virtual desktops independently in activities?

The problem is the following:
Lets say we have two activities and two virtual desktops. According to the concept of activities (if I got it right) each activity has its own two virtual desktop. Or at least it should be like this, I think. If in this situation we change to desktop2 in activity1, and then switch to activity2, then we will find ourselves on desktop2 of activity2, regardless what was selected previously in activity2. If now we change to desktop1 (we are in activity2) and then switch back to activity1, we will arrive in desktop1 too. But we left activity1 from desktop2! For me it has no sense, since I want to use activities to have really independent work places.
Is there a solution? Or is it seems to be a bug?

It's not implemented yet, here's the relevant wish: https://bugs.kde.org/show_bug.cgi?id=265015

Thanks. Sorry I haven't found it. I really searched.