The Alt+number keyboard shortcuts to open the Explorer, Problems, NuGet, Unit Tests, and Git tabs are not working for me in Rider 2022.1. For example, I can no longer use Alt+8 to open the Unit Tests window. Though none of these shortcuts any longer open the corresponding windows, they can still be used to close those windows.
(In 2020, in Editor Tabs Lose Numbers, I reported that the numbers were no longer shown on the tabs, though the shortcuts still worked. In that thread, I learned of a setting to show the numbers again. Today, I have the converse of that problem. I still have that setting, and the numbers are still shown on the tabs, along with tool tips that confirm that the numbers are still supposed to indicate keyboard shortcuts. But the keyboard shortcuts no longer work properly.)