Problem with selected items in a freeform "pick many"


I have a slide of a "pick many" question with objects as answers.

Although the question is defined as the pick many question, I can choose only one answer.
In the form view I see the correct answers selected, but when I publish the slide I can only choose one object at a time, so the feedback I get is that it's a mistake.

Can you direct me to a relevant tutorial or to a solution?



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