Problems with wpnav_speed parameter

I’m currently editing wpnav_speed parameter during the flight to change vehicle speed. It works quite well when the vehicle is close to the starting waypoint but as it approaches to target waypoint, it ignores the wpnav_speed parameter (i know it is supposed to slow down as it approaches to target waypoint. What i want to do is slowing down further). So lets say i have a survey mission with line lenghts 400m. Vehicle updates its speed according to wpnav_speed param until approximately 60m before reaching the target wp. Is there a way to make it always respond to wpnav_speed parameter? Im editing the wpnav_speed parameter via lua scripts, same thing happens with set_desired_speed(). Is this a bug or a feature?

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