Right, did it click and delete the first time, but not actually disappear? If so then this looks like another issue like Possible bug ( UI dashboard switch node or function switch Node)
If you have not deployed can you refresh the browser and export just the nodes each end of that wire and export and paste it here please, to confirm the problem, which is that there are actually two wires there. Then I will submit an issue for the developers, to look at.
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