Steps to Reproduce

<bandbox id="box2" visible="false">
<bandpopup>
pp
</bandpopup>
</bandbox>
<button label="invisible but open" onClick='box2.setOpen(true);Clients.showNotification(box2.isOpen()+"")'/>
2. click the button

Current Result

it shows true

Expected Result

it shows false

Debug Information

• in the comment of setOpen(), it said it "only works while visible", then it should not change _open before checking visible