Just updated to 21.16 and found that my indicated position along the elevation profile on the map screen is off +/- a couple of hundred yards. I'll be past the crest of a hill and it shows me still climbing, or vice versa.
IDK if this is new with 21.16 or not as I previously had the elevation profile on the map turned off. It got turned on when I created a new activity profile by copying another in which it was set to off. A bunch of other settings also copied wrong. e.g. changed to road from mtb. Avoidances changed, etc... That's another problem but only with creating a profile, not an issue while riding after going in and correcting the errors.