Can't see functions after publishing the add-on

[Eliagandolfi]

If I run the script as a Google App-script, it works as great

but if I publish the add-on, the functions disappear, and I can only see the "help" option

[Eliagandolfi]

For reference, I solved it by tweaking the onOpen() function as below

function onOpen() {
  var ui = SpreadsheetApp.getUi().createAddonMenu();
  ui.addItem('Import Question', 'importQuestion');
  ui.addItem('Import All Questions', 'importAllQuestions');
  ui.addToUi();
}