My #1 issue with Windows 11 is not being able to un-group my taskbar items.
I found having multiple instances of apps open across multiple monitors was extremely painful after using it ungrouped for so many years. And the little dot provided to indicate an open app is worthless. I resorted to StartAllBack to fix it. Everything else has been generally fine for me. So disappointed.
There are several highly voted feedback posts and comments about the taskbar but I don't think I've seen anyone at MS acknowledge any of it.
(Main suggestion is currently at 11k votes. https://aka.ms/AAeyt69)
And as if that wasn't enough, sometimes just clicking the taskbar item does nothing. It can sometimes take several clicks to get it to re-open an app.
I had this same issue, but the only way I have found is to use something like Explorer Patcher [0], but it "solves" the problem by just replace the Win11 bar with the one from Win10