I think @burner is referring to wires?
There was a long discussion on debug changes at https://discourse.nodered.org/t/should-debug-nodes-be-capable-of-passing-the-message-forwards/
I think the general feeling was that wires should not acquire debugging abilities, nor should debug nodes pass the message onwards.
Among alternative suggestions were:
- The message handling code should allow debug output at any node's input or output connector.
- Junction nodes should be given a debug role. This one seems the simplest to implement.