However if the editor page is zoomed in or out by 1 click (buttons at bottom right of editor), the wire never changes to dashes and you can't drop the node into it.
This is on 3.1.0-beta2.
Looking at a Node-red installation on a different Pi, 3.0.2 seems to be working OK
"dev tools" - if this is the same as Right click, "Inspect (Q)", nothing shows up on the Console tab when I drag the node over the wire either zoomed or full size.