Option Shift word selection doesn't work in Visual Studio Code on Mac OS Big Sur I can't exectly say when this started, but from some version of Visual Studio Code Option + Shift + Right Arrow/Left Arrow selection stopped working. Currently I use macOS Big Sur, but I am almost sure that this started before upgrading to Big Sur. Can anyone help me to fix this?
UPDATE: I use macOS Big Sur 11.2.2 and VS Code 1.53.2.

UPDATE 2: OPTION + SHIFT + UP/DOWN Arrow works for me, actually this shortcut adds one more cursor to other line.

UPDATE 3: This is not shortcut probelm:
The fact that opt+shift+up/down work seems to suggest that this is an keybinding issue.
Under your VSCode keybindings, check to see if the keybinding cursorWordLeftSelect and the corresponding right select ones are active. If they are active, check to see if any other extensions override these shortcuts (by searching for the keybind: opt+shift+left).

Hopefully this fixes the issue.