Yank back killed text `ctrl+y` stopped working

<!-- Please search existing issues to avoid creating duplicates. --> <!-- Also please test using the latest insiders build to make sure your issue has not already been fixed: https://code.visualstudio.com/insiders/ --> <!-- Use Help > Report Issue to prefill these. --> - VSCode Version: 1.33.1 ( Recent ) - OS Version: Mac 10.14.4 Steps to Reproduce: 1. `ctrl+k` to kill text. 2. `ctrl+y` to paste the kill text does not work. <!-- Launch with `code --disable-extensions` to check. --> Does this issue occur when all extensions are disabled?: Yes Works on all other program except vscode.