Make a new Blueprint in a project for example based in an actor.
Add in the Blueprint actor lets say 2 actors of Skeletal mesh, then in some part of the blueprint get one of the actor reference and call into a node, save all, close and reopen that same Blueprint, now remove the actor that is actually connected in one of these nodes, after that save, then ctrl z to get back the actor. Now the nodes should show connected but no connected nowhere at same time…
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