One possibility is that the keyboard setting is bad for the massive amount of shortcuts we are using. The system default input source is ABC - Extended
, which causes ⌥+⇧+f to input a ̰
character. For example, in VS Code, to format a document, one uses ⌥+⇧+f, which inputs ̰
instead of executing the shortcut.
Just change the ABC - Extended
input source to ABC
.