In my view—and this has been the case for a few years now—it is important to ensure the file is saved using the HERE setting at the end if you actually want to use MRA Navigation Next (HERE) to navigate the route.
I use MRA Navigation Next (HERE).
However, I always do my initial planning using the OSM map because it contains more information.
I have the HERE algorithm calculate the route directly, as it needs to be compatible with MRA Navigation Next (HERE).
Occasionally, though, I switch to the OSM algorithm and save using OSM, or vice versa. Unfortunately, this isn't immediately obvious at a glance, so this information might well be helpful to others.
This is particularly relevant for those who plan using the OSM map and OSM algorithm—since that allows for a curvier route—but then forget to switch to the HERE algorithm at the end to ensure proper navigation in MRA Navigation Next (HERE).