At least I guess that it can only be a bug:
I make extensive use of jump thoughts, as they are also a wonderful way to display all the topics of a thought to which they are attached - sort of a keyword index/overview for a given thought.

In order to create one, I use the corresonding keyboard shortcut (Ctrl-K). Pretty straightforward - but only if the thought to be created does not already exist (somewhere in the brain). Because when you then select the already existing thought from the selection window, a link is created but NOT the corresponding jump thought.

And if I do explicitly click on “+ Create jump” (as the first option), then a new thought with the same name is actually created, which means that you suddenly have 2 thoughts with the same name – the new, empty one and the existing one. This makes no sense at all, in my opinion, and can only be a bug. But maybe I'm wrong?