uncluster layer onFeatureTapped callback is not working in iOS

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Hey Mapbox team @zugaldia @mourner @sbma44 @kkaefer, in my app I have added source & layer in Mapbox with cluster, but I am facing an issue on FeatureTapped callback on uncluster-layer is not working.
Tap works on cluster circle but not on uncluster layer (eg. $25K).

Could you help me fix this issue on iOS?

```
mapController?.onFeatureTapped.add(onPinTap);

void onPinTap(dynamic data, Point point, LatLng latLng) async {
print('clicked')
}
```

Start with the reported mapController?.onFeatureTapped.add(onPinTap) registration and the clustered source and layer setup, then reproduce the unclustered feature tap on iOS using the provided callback snippet. Done means taps on the unclustered feature invoke onPinTap as well as taps on the cluster circle; the issue names no source file or test.

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