Rubberbanding a Route will not catch WP
Rubberbanding will normally lock on nearby places / airports or intersections. But it will not recognize user waypoints. These can only be inserted through the search function.
Well-spotted, Leif! As it is so easily demonstrated hopefully Rob will be able to fix it quickly!
Rob has confirmed the bug - and fixed in in Version 4.1.302. I'm not sure when that version - or a derivative - might be released as a public beta, but whenever the next public beta comes out it should be fixed. Thanks again for reporting it, Leif!