Node-RED 301.0 beta2 is where the junctions were not being placed under the cursor (see Node-RED 3.1.0-beta.2 released) for details
However, I have also tried on v3.02 and I still haven't found a way of finding junctions. As jbudd says, ctrl-f junction does not work (type in junction - no matches found)
@jbudd Thank you for the flow, it does work. I now know I have a couple of random junctions somewhere, but no way of finding them 
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