I would like to present in the below images weird door threshold behavior in Revit.
I discovered it when I was trying to annotate a level of the door threshold in structural wall.
What I discovered is that door threshold is not visible by default at the level where doors are placed or below it and only when doors are raised by more than 0.159 mm it appears in plan.
Please notice the Sill Height set to 0.159mm. From 0. 160mm sill becomes visible.
In project on which I was working I end up moving all doors up by 0.16mm to be able to place elevation mark on the thresholds.
I believe it would be better to make a parameter which would switch door threshold visibility instead of implementing this weird behavior.