Create a simple BS4 checkbox (and other controls). Add an onchange event to the checkbox. Copy the control and paste it. In the right click menu of the pasted control, notice the go to event shows the onchange event function name for the original control, not a blank name, as an event is not defined. Further, if you rename the pasted control before you create the onchange event, the right click still shows the original onchange event function name. Actually clicking on the go to event menu item does create the correct new event, but it was quite confusing at first as to what was going on.
I’ve filed an issue for this one. Thanks!