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If a subclass of MGLMapView registers itself as an observer of a non-multipoint annotation’s coordinate key path but fails to handle the change in its -observeValueForKeyPath:ofObject:change:context: implementation, the context would likely be a value other than the annotation’s tag. In that case, avoid doing anything in response to the coordinate changing. Even if the context in that case happens to match the annotation’s tag – say, because the developer passed in NULL (which is equal to 0) for the first added annotation (which would have a tag of 0) – the result would be an unnecessary but harmless update.
Mapbox OS X SDK
A library based on Mapbox GL Native for embedding interactive map views with scalable, customizable vector maps into Cocoa applications on OS X 10.10.0 and above using Objective-C, Swift, or Interface Builder.
This SDK is analogous to the Mapbox iOS SDK, and much of the iOS SDK documentation applies here. Mapbox does not officially support the OS X SDK to the same extent as the iOS SDK; however, bug reports and pull requests are certainly welcome.