On change event not triggered

In a form I have some fields that are conditional visible. These fields have an on change microflow. But this microflow is never triggered. I can change the value as much as I like without the microflow coming in action (I had a breakpoint there to see why nothing happened and the breakpoint never comes in action). This looks like a bug. [EDIT] Found the problem. My mistake (I was working in a duplicate of the form).
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