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First, please search through existing issues to ensure that the bug has not already been reported. You can start the search here: https://issuetracker.google.com/savedsearches/5051604

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If your issue has not been reported, please provide all of the following:

A short description of the issue:

When you have multiple checkboxes checked, the formInput object doesn't show all the checked values.

A small code sample that reliably reproduces the issue. The sample should run as-is or with minimal setup, without external dependencies.

function onHomepage(e) {
  const builder = CardService.newCardBuilder();
  builder.addSection(CardService.newCardSection()
    .addWidget(CardService.newSelectionInput()
      .setTitle('Colors')
      .setFieldName('colors')
      .addItem('Red', 'red', false)
      .addItem('Green', 'green', false)
      .addItem('Blue', 'blue', false)
      .setOnChangeAction(CardService.newAction()
        .setFunctionName('onColorChange')
      )
    ));
  return builder.build();
}

function onColorChange(e) {
  switch (e.hostApp) {
    case 'sheets':
      return notify(JSON.stringify(e.formInput));
    default:
      return notify('Host app not supported.');
  }
}

function notify(message) {
  const notification = CardService.newNotification().setText(message);
  return CardService.newActionResponseBuilder()
    .setNotification(notification)
    .build();
}

What steps will reproduce the problem?

1. Check the Red and Blue color options
2. Notice the formInput doesn't actually reflect what you checked

What is the expected output? What do you see instead? If you see error messages, please provide them.

Expected result:

{
  colors: ['red', 'blue']
}

Actual result:

{
  colors: 'blue'
}

Please provide any additional information below.

It seems this widget, when in the default CHECKBOX mode, does not really support multiple selections as it only returns the last checked value.