Just a followup to this, I filed an issue here [0]

It seems something is wrong in @geometry_point_num array when zooming at a
level where the geometry is cropped by the canvas extent. 

This is the expression doing the work in a line geometry generator on a
marker line symbol: 

z(point_n($geometry,@geometry_point_num))


[0] http://hub.qgis.org/issues/16484



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