Short streams with big endpoints

[scarapella]

I noticed that there are a few endpoints on the endpoint map which seem to have a surprising amount of upstream. For example

Node 1153529364 (josm) has 485559 km of upstreams and ends here

the stream in question is about 1.3k in length according to id. The stream does terminate in a node which is shared with a water area. I thought perhaps the issue was an old school tagging of that way as waterway=riverbank, but that is not the case. It has a proper tagging of natural=water,water=rapids.

So I am at a loss to identify the issue in the tagging so suspect a bug.

Cheers
scarapella

[scarapella]

Another example
Node 1175856784 (josm) has 174350 km of upstreams and ends here