I got the same problem and I think [this][1] answers your question and it worked for me. To be more specific, you need to mask ctrl +v by default.

    $ mkdir ~/Library/KeyBindings/
    $ vi ~/Library/KeyBindings/DefaultKeyBinding.dict
    {
       "^v" = "noop:";
    }

  [1]: https://github.com/jupyter/notebook/issues/4138#issuecomment-642584355