NR v3.0.1
node.js v14.16.0
macOS v12.5
Happens using Safari, FireFox and Chrome
1 - Open any flow with multiple tabs
2 - go to the last tab
3 - click on the output of any node and stretch out a line but do not connect it to anything
4 - keep holding the mouse down and press ctrl-shift-back arrow
You should be transfered to the first tab of the flow and the line will be just hanging there not connected to anything. It will show on each tab you have and you can not select it.