You’ve done too many recent edits to make it easy to work out to what you are referring, but validation errors are often just a hint to look closely. The real world may be more complex than that assumed by the validator.
I assume the wetland drains into Lag Grond so theoretical the stream continues. In my opinion wetland is the same as riverbank (where an imaginary waterway flows between the riverbanks). I would continue drawing the stream through the wetlandarea and the lake to connect to node 4103954817 .
Is it the iD ditor that’s flagging the “error” or something else?
Often OSM QA tools will flag “errors” that aren’t really errors at all. You’ve been there; you know what the situation is. QA tools can help to detect accidental mistakes, but they can also flag “false positives” - things that really aren’t problems at all.
I have the Vespucci app installed on my tablet. This editor shows bugs. This bug is marked as “Osmose: Unconnected waterway or wrong way flow”
Is Osmose a QA tool?
Is it possible to display these bugs in the iD Editor?
In Vespucci I often find that the osmose prompts are for things that I couldn’t care less about and not the thing that I opened Vespucci up to edit in the first place! They’re still useful though (even if you ignore them) - they make you think about things that you might not otherwise have considered.