Originally Posted by Predicate
That behavior is exactly correct. NamePlate1 is always associated with the unit "nameplate1". However, "nameplate1" can be associated with different units at different times, because nameplates are dynamically assigned. That is, UnitIsUnit("nameplate1", "target") can change from true to false even if you don't switch targets -- simply because the nameplates got rearranged. Currently, all nameplates get refreshed whenever any CVar changes (hence the behavior you're seeing with changing the nameplate settings).
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This is pretty dumb, because then you can never know when is your unitID is gonna get rearranged to something else. You can't hook every cvar change, and there is no event to listen.
Edit: It seems like cvar updates trigger the NAME_PLATE_UNIT_ADDED, NAME_PLATE_UNIT_REMOVED events so it's gucci if you update based on those.