What is shortcut for uncomment in Visual Studio Code?
I just updated my VSCode to the version you mentioned. The combinations work exactly as you described. It must be something that was changed on your computer.
Go to File => Preferences => Keyboard Shortcuts
(Or press CTRL + K and then CTRL + S)
look for Remove Line Comment. In my settings it still says
If your VSCode has a different keybinding, change it back to what you want.
I had the same problem. In the newer version its actually CTRL+/ to uncomment.
CTRL+/
Note that this is the / on the numeric keypad!