After setting MapStyle from `.standard(lightPreset: .night)` to `.standard` it remains in night style

[alvar-bolt]

Environment

• Xcode version: Version 16.4 (16F6)
• iOS version: iOS 26.0 (23A343)
• Devices affected: iPhone
• Maps SDK Version: 11.15.1

Observed behavior and steps to reproduce

After setting MapStyle from .standard(lightPreset: .night) to .standard it remains in night style

...
init()
    mapView.mapboxMap.mapStyle = .standard
}


override func traitCollectionDidChange(_ previousTraitCollection: UITraitCollection?) {
    super.traitCollectionDidChange(previousTraitCollection)

    if previousTraitCollection?.hasDifferentColorAppearance(comparedTo: traitCollection) == true {
        if traitCollection.userInterfaceStyle == .dark {
            mapView.mapboxMap.mapStyle = .standard(lightPreset: .night)
        } else {
            mapView.mapboxMap.mapStyle = .standard
        }
    }
}

Expected behavior

Map style is set to same "standard" as it was in init.

Notes / preliminary analysis

This behaviour seems to stem from fact that in .standard lightPreset is nil which later causes it to be ignored in MapStyleReconciler as value to be changed.

mapbox-maps-ios/Sources/MapboxMaps/ContentBuilders/MapContent/MapStyleReconciler.swift

Line 119 in 0c92cef

guard let value, value != old?[key] else {

Is this actually expected behaviour from .standard use? Or is it a bug?