Hello, I write a new question type plugin "ku_bf". When I create a question with this question type, that's ok, but if I click "Blanks 3 more choices", then I got a error. I find the reason, if I click the button, the value of qtype change from ku_bf to kubf, but I don't know why....
the "Blanks 3 more choices" button is created by moodle self.
before click button:
after click button:
