Using cam-choices in embedded form gives me invalid form

Hi,

I faced an issue when I used this tutorial on how to “Populating the Options from a Variable

and the options were populated successfully, but the select field was marked with “ng-empty ng-invalid ng-invalid-required ng-dirty” and the complete button was disabled

here is a screenshot of the HTML element
Screenshot-20201008111608-365x131

p.s.: I’m using camunda 7.13