Github user mcgilman commented on the issue:
https://github.com/apache/nifi/pull/2957
@markobean I've replicated the behavior and believe there is a bug here.
However, I don't think the proposed solution is the proper way to address it.
The points in question are `visibility: hidden` to ensure they remain
clickable. I believe the issue is the order the drag behavior is added to the
points. Can you please try moving the drag behavior for the `midpoints` and the
`endpoints` to below where the `mousedown` listeners are registered and see if
that addresses the issue.
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