Hi Jerome - I don't think you are missing anything, and it's got wondering if this is a bug because I don't remember earlier versions of BP did not do this appending thing. I'd recommend raising a ticket with Support to see what they say (if I do it I'll only have o relay questions between you and them and it will slow things down). But even if it is a bug, it's uncommon to want to navigate to a different URL in the same object, usually you use separate objects. I know this doesn't solve your problem, but it's just to add some perspective.