So this may be a solution to this issue, at least it has been working for me. If you open the store and click the little half person in the upper right portion next to the search box, then choose...

I'm not sure how the built in works, but I have Display Fusion and can customize the taskbar on the other screen. If you don't like Windows version, try Display Fusion or Ultra Mon or something of...

I know it doesn't provide any real answers, but this is happening frequently to me as well. So you're not alone.