I also reported the possible way to solve this as Idea first, but its more a big Problem for me.
The variable "Route interpolation Step" is used for Manual drawn routes while planning them. But while saving there is still a fixed constant of 100m used.
So if i set the Variable "Route interpolation Step" to 20m, I see a 20m interpolated Height-Profile while planning. But while Saving the Route, a fixed constant of 100m is used und many points get lost.
Because the variable in ExpertSettings is normaly also set to 100m, it would not change anything for normal users.
I think its the correct way to also use seh variable "Route interpolation step" instead of the fixed constant of 100m while saving a Manual route.
Its a just win situation...