Solved
There seems to be something wrong with vectors. My guess is that if the endpoint is not integers, then funny things happen.
u/Length(u) should be a vector, not a list divided by a number.
The same happens on GeoGebra classic 6 and 5.
M
The same problem 
Hyvää huomenta Mikko!
Please try version .460 :)
https://help.geogebra.org/t...
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