cannot make a question mandatory (not optional) - also no back button

example.
Next button starts grey, then goes active within 1 second.
Doesnt matter if optional: false, or commented out
For now, I have reverted back to https://github.com/appliedrd/research.package.git branch: realign

List likert7PointAgreeChoices = [
RPChoice(text: "Strongly disagree", value: 1),
RPChoice(text: "Disagree", value: 2),
RPChoice(text: "Somewhat disagree", value: 3),
RPChoice(text: "Neither agree or disagree ", value: 4),
RPChoice(text: "Somewhat agree", value: 5),
RPChoice(text: "Agree", value: 6),
RPChoice(text: "Strongly agree", value: 7),
];

RPChoiceAnswerFormat likert7PointAgreeChoicesAnswerFormat = RPChoiceAnswerFormat(
answerStyle: RPChoiceAnswerStyle.SingleChoice,
choices: likert7PointAgreeChoices,
);

RPQuestionStep s2_1 = RPQuestionStep(
identifier: "s2_1",
title: "1. Overall, the workshop was easy to understand.",
// optional: false,
answerFormat: likert7PointAgreeChoicesAnswerFormat);

Reproduce the example using RPQuestionStep with optional: false and the RPChoiceAnswerFormat shown in the issue, starting from the realign branch reference. Verify both reported behaviors: the Next button should not activate before a mandatory answer, and navigation should provide a working back button.

Written by the indexing model from the issue text.