Recently my ‘clear formatting’ shortcut for most google apps (Command (or Cmd) ⌘ + \) stopped working on my Macbook.
This was very frustrating as I use it all the time.
Apparently the 1password took over this shortcut since it uses cmd+\ to fill logins, silently. I was able to change the shortcut in 1password preferences, at which point clear formatting started working again.
In the future, if you have a similar issue, there’s also an app called ShortcutDetective that can help you find out if a keyboard shortcut is being used for an app on your Mac.