Hi, 
the reason was that OSMI routing view (https://wiki.openstreetmap.org/wiki/OSM_Inspector/Views/Routing) detected  the end nodes of these 0.5 meter short ways as unconnected ways and classified this as priority 1 error. 

So it  appears as a prominent error.  

You might argue that this is a false positive, but OSMI routing view detects these errors for a reason: It cannot know that the way ends with the tagged gate.

It would not detect the error if you continue the super short way behind the gate as in this case: https://www.openstreetmap.org/way/1416131842